APS 2021 talk slides: Energy carried by gravitational waves in bimetric gravity
I haven’t been posting every time I gave a talk, so here is a sporadic update. I contributed a talk to the 2021 April APS meeting. This talk is a status u...
I haven’t been posting every time I gave a talk, so here is a sporadic update. I contributed a talk to the 2021 April APS meeting. This talk is a status u...
Just one more committee
Highly precise and robust waveform models are required as improvements in detector sensitivity enable us to test general relativity with more precision t...
Gravitational memory effects and the BMS freedoms exhibited at future null infinity have recently been resolved and utilized in numerical relativity simu...
Numerical relativity (NR) simulations of binary black holes provide precise waveforms, but are typically too computationally expensive to produce wavefor...
Numerical relativity simulations provide the most precise templates for the gravitational waves produced by binary black hole mergers. However, many of t...
The Bondi-van der Burg-Metzner-Sachs (BMS) group, which uniquely describes the symmetries of asymptotic infinity and therefore of the gravitational waves...
Quasi-normal mode (QNM) modeling is an invaluable tool for characterizing remnant black holes, studying strong gravity, and testing general relativity. ...
Understanding the Bondi-Metzner-Sachs (BMS) frame of the gravitational waves produced by numerical relativity is crucial for ensuring that analyses on su...
We present a new study of remnant black hole properties from 13 binary black hole systems, numerically evolved using the Spectral Einstein Code. The mass...
We study the structure of asymptotic null infinity in the Brans-Dicke theory of gravity
Angular momentum is tricky to define in GR! Here’s an approach so that observers can all agree with each others’ measurements.
We perform a new test of general relativity (GR) with signals from GWTC-2, the LIGO and Virgo catalog of gravitational wave detections. We search for the...
The first astrophysically-relevant numerical simulation of merging black holes in a higher-curvature theory beyond GR.
The first numerical beyond-GR binary black hole merger simulation.
Want to hear me talk about numerical relativity and theories beyond GR?
Finding the shape of extremal black holes in beyond-GR theories
Here to save you some algebra and column-inches
Just an update on talks I gave recently. Valeria Ferrari, Leonardo Gualtieri, and Paolo Pani hosted the conference “New Frontiers in Gravitational-Wave Astr...
One of the first numerical simulations of black hole mergers in beyond-GR effective field theories
My talk slides/movies from TG17 and APS17
My talk slides/movies from the FF2016 conference at Northwestern
My talk slides/movies from the GR21 conference in NYC
My talks slides/movies from the 2016 April APS meeting in SLC
Progress in understanding the structure of extremal black holes in Chern-Simons
Numerical solutions for rapidly-rotating dCS black holes show where the weak-coupling expansion breaks down.
The post-Newtonian calculation scheme applied to binary inspirals in a broad class of almost-GR theories.
One of the important targets for the future space-based gravitational wave observatory LISA is extreme mass ratio inspirals (EMRIs), where long and accur...
Just one more committee
In theories of gravity that include a scalar field, a compact object’s scalar charge is a crucial quantity since it controls dipole radiation, which can be s...
Finding the shape of extremal black holes in beyond-GR theories
Here to save you some algebra and column-inches
Not all theories with long-ranged scalar fields produce dipole radiation in binaries
The post-Newtonian calculation scheme applied to binary inspirals in a broad class of almost-GR theories.
I missed the author index from LRR, so I rebuilt one.
Numerical relativity simulations provide the most precise templates for the gravitational waves produced by binary black hole mergers. However, many of t...
We present a numerical-relativity simulation of a black hole - neutron star merger in scalar-tensor (ST) gravity with binary parameters consistent with t...
We perform a new test of general relativity (GR) with signals from GWTC-2, the LIGO and Virgo catalog of gravitational wave detections. We search for the...
Gravity theories beyond general relativity (GR) can change the properties of gravitational waves: their polarizations, dispersion, speed, and, importantly, e...
I hosted a Quora session. It went well!
One of the important targets for the future space-based gravitational wave observatory LISA is extreme mass ratio inspirals (EMRIs), where long and accur...
I missed the author index from LRR, so I rebuilt one.
Here are a few tips for making your matplotlib figures look really “right” in a LaTeX publication.
Highly precise and robust waveform models are required as improvements in detector sensitivity enable us to test general relativity with more precision t...
Gravitational memory effects and the BMS freedoms exhibited at future null infinity have recently been resolved and utilized in numerical relativity simu...
Numerical relativity (NR) simulations of binary black holes provide precise waveforms, but are typically too computationally expensive to produce wavefor...
Numerical relativity simulations provide the most precise templates for the gravitational waves produced by binary black hole mergers. However, many of t...
We present a numerical-relativity simulation of a black hole - neutron star merger in scalar-tensor (ST) gravity with binary parameters consistent with t...
Our latest paper, Nonlinearities in black hole ringdowns, was just published in Physical Review Letters! This article was selected as an ❦ Editors’ Suggesti...
This article was selected as an ❦ Editors’ Suggestion, and Featured in APS’s Physics magazine. More press coverage links here.
The Bondi-van der Burg-Metzner-Sachs (BMS) group, which uniquely describes the symmetries of asymptotic infinity and therefore of the gravitational waves...
Quasi-normal mode (QNM) modeling is an invaluable tool for characterizing remnant black holes, studying strong gravity, and testing general relativity. ...
Understanding the Bondi-Metzner-Sachs (BMS) frame of the gravitational waves produced by numerical relativity is crucial for ensuring that analyses on su...
We present a new study of remnant black hole properties from 13 binary black hole systems, numerically evolved using the Spectral Einstein Code. The mass...
A surrogate model extending the parameter space range of fully precessing quasicircular inspirals
Accurate models of gravitational waves from merging black holes are necessary for detectors to observe as many events as possible while extracting the maximu...
Sometimes in a numerical method, you need to be able to continuously turn a calculation on or off in space or time.
Interactive toy for visualizing relationship between polynomial roots and coefficients
Here to save you some algebra and column-inches
An identity between vector commutation coefficients and coframe connection coefficients
These three objects form a superalgebra! Whoa!
There is a nice 4-dimensional Weyl identity that I can never seem to remember off the top of my head; so I decided I need to write this note so I don’t have ...
Highly precise and robust waveform models are required as improvements in detector sensitivity enable us to test general relativity with more precision t...
Gravitational memory effects and the BMS freedoms exhibited at future null infinity have recently been resolved and utilized in numerical relativity simu...
Numerical relativity (NR) simulations of binary black holes provide precise waveforms, but are typically too computationally expensive to produce wavefor...
The Bondi-van der Burg-Metzner-Sachs (BMS) group, which uniquely describes the symmetries of asymptotic infinity and therefore of the gravitational waves...
Quasi-normal mode (QNM) modeling is an invaluable tool for characterizing remnant black holes, studying strong gravity, and testing general relativity. ...
Understanding the Bondi-Metzner-Sachs (BMS) frame of the gravitational waves produced by numerical relativity is crucial for ensuring that analyses on su...
I haven’t been posting every time I gave a talk, so here is a sporadic update. I contributed a talk to the 2021 April APS meeting. This talk is a status u...
We present a new study of remnant black hole properties from 13 binary black hole systems, numerically evolved using the Spectral Einstein Code. The mass...
We study the structure of asymptotic null infinity in the Brans-Dicke theory of gravity
Angular momentum is tricky to define in GR! Here’s an approach so that observers can all agree with each others’ measurements.
I am honored to have been selected as one of this year’s Sloan Research Fellows!
We present a numerical-relativity simulation of a black hole - neutron star merger in scalar-tensor (ST) gravity with binary parameters consistent with t...
One of the key ingredients for making binary waveform predictions in a beyond-GR theory of gravity is understanding the energy and angular momentum carri...
I haven’t been posting every time I gave a talk, so here is a sporadic update. I contributed a talk to the 2021 April APS meeting. This talk is a status u...
We perform a new test of general relativity (GR) with signals from GWTC-2, the LIGO and Virgo catalog of gravitational wave detections. We search for the...
We study the structure of asymptotic null infinity in the Brans-Dicke theory of gravity
The first astrophysically-relevant numerical simulation of merging black holes in a higher-curvature theory beyond GR.
The first numerical beyond-GR binary black hole merger simulation.
Want to hear me talk about numerical relativity and theories beyond GR?
Gravity theories beyond general relativity (GR) can change the properties of gravitational waves: their polarizations, dispersion, speed, and, importantly, e...
In theories of gravity that include a scalar field, a compact object’s scalar charge is a crucial quantity since it controls dipole radiation, which can be s...
Finding the shape of extremal black holes in beyond-GR theories
Here to save you some algebra and column-inches
Just an update on talks I gave recently. Valeria Ferrari, Leonardo Gualtieri, and Paolo Pani hosted the conference “New Frontiers in Gravitational-Wave Astr...
One of the first numerical simulations of black hole mergers in beyond-GR effective field theories
My talk slides/movies from TG17 and APS17
My talk slides/movies from the EHT16 conference in Cambrige, MA
My talk slides/movies from the FF2016 conference at Northwestern
My talk slides/movies from the GR21 conference in NYC
My talks slides/movies from the 2016 April APS meeting in SLC
Invited review for CQG Focus Issue
Progress in understanding the structure of extremal black holes in Chern-Simons
Not all theories with long-ranged scalar fields produce dipole radiation in binaries
A major review on non-GR theories, black holes and neutron stars in non-GR theories, compact binaries in non-GR theories, and pulsar, gravitational-wave, and...
Numerical solutions for rapidly-rotating dCS black holes show where the weak-coupling expansion breaks down.
MIT PhD thesis of Leo C. Stein
The post-Newtonian calculation scheme applied to binary inspirals in a broad class of almost-GR theories.
Highly precise and robust waveform models are required as improvements in detector sensitivity enable us to test general relativity with more precision t...
Gravitational memory effects and the BMS freedoms exhibited at future null infinity have recently been resolved and utilized in numerical relativity simu...
We numerically investigate the imprints of gravitational radiation-reaction driven changes to a black hole’s mass and spin on the corresponding ringdown ...
In this short Note, I answer the titular question: Yes, a radiation gauge can be horizon-locking. Radiation gauges are very common in black hole perturbat...
Numerical relativity (NR) simulations of binary black holes provide precise waveforms, but are typically too computationally expensive to produce wavefor...
Numerical relativity simulations provide the most precise templates for the gravitational waves produced by binary black hole mergers. However, many of t...
We present a numerical-relativity simulation of a black hole - neutron star merger in scalar-tensor (ST) gravity with binary parameters consistent with t...
Our latest paper, Nonlinearities in black hole ringdowns, was just published in Physical Review Letters! This article was selected as an ❦ Editors’ Suggesti...
This article was selected as an ❦ Editors’ Suggestion, and Featured in APS’s Physics magazine. More press coverage links here.
The Bondi-van der Burg-Metzner-Sachs (BMS) group, which uniquely describes the symmetries of asymptotic infinity and therefore of the gravitational waves...
One of the important targets for the future space-based gravitational wave observatory LISA is extreme mass ratio inspirals (EMRIs), where long and accur...
Quasi-normal mode (QNM) modeling is an invaluable tool for characterizing remnant black holes, studying strong gravity, and testing general relativity. ...
Accurate and efficient modeling of the dynamics of binary black holes (BBHs) is crucial to their detection through gravitational waves (GWs), with LIGO/V...
Understanding the Bondi-Metzner-Sachs (BMS) frame of the gravitational waves produced by numerical relativity is crucial for ensuring that analyses on su...
We present a new study of remnant black hole properties from 13 binary black hole systems, numerically evolved using the Spectral Einstein Code. The mass...
We show that an eccentric binary of black holes with misaligned spins is integrable at 2PN order. We also construct 4 out of 5 action variables at 1.5PN.
Merger dynamics create an attractive fixed-point in the space of distributions
Last week I gave an invited talk at the Spring 2020 workshop of the Black Hole Perturbation Toolkit (BHPToolkit). The BHPToolkit is a collection of open sou...
The first astrophysically-relevant numerical simulation of merging black holes in a higher-curvature theory beyond GR.
The dividing line between bound and plunging orbits is an algebraic variety
qnm is an open-source Python package for computing the Kerr quasinormal mode frequencies, angular separation constants, and spherical-spheroidal mixing coeff...
Hear me, Katie Bouman, and friends talk about how to snap a picture of a black hole with the Event Horizon Telescope!
The first numerical beyond-GR binary black hole merger simulation.
A surrogate model extending the parameter space range of fully precessing quasicircular inspirals
Accurate models of gravitational waves from merging black holes are necessary for detectors to observe as many events as possible while extracting the maximu...
I’m on Episode 42 of the Starts with a Bang Podcast
Want to hear me talk about numerical relativity and theories beyond GR?
Real-time interactive visualizations of merging black holes in seconds!
Modeling black holes remnants directly from numerical relativity
The grand challenges of contemporary fundamental physics—dark matter, dark energy, vacuum energy, inflation and early universe cosmology, singularities an...
In theories of gravity that include a scalar field, a compact object’s scalar charge is a crucial quantity since it controls dipole radiation, which can be s...
Modeling black holes’ kicks directly from numerical relativity
Finding the shape of extremal black holes in beyond-GR theories
Just an update on talks I gave recently. Valeria Ferrari, Leonardo Gualtieri, and Paolo Pani hosted the conference “New Frontiers in Gravitational-Wave Astr...
Whenever you’ve got symmetry, you should use it!
One of the first numerical simulations of black hole mergers in beyond-GR effective field theories
My talk slides/movies from TG17 and APS17
My talk slides/movies from the EHT16 conference in Cambrige, MA
My talk slides/movies from the FF2016 conference at Northwestern
My talk slides/movies from the GR21 conference in NYC
I’m on Episode 64 of the Titanium Physicists Podcast
My talks slides/movies from the 2016 April APS meeting in SLC
Interactive tool for visualizing spherical/circular photon orbits in Kerr
I hosted a Quora session. It went well!
Invited review for CQG Focus Issue
I’m on Episode 62 of the Titanium Physicists Podcast
Progress in understanding the structure of extremal black holes in Chern-Simons
Interactive tool to compute Kerr quantities
Interactive tool to compute ISCOs in Kerr
A major review on non-GR theories, black holes and neutron stars in non-GR theories, compact binaries in non-GR theories, and pulsar, gravitational-wave, and...
Numerical solutions for rapidly-rotating dCS black holes show where the weak-coupling expansion breaks down.
MIT PhD thesis of Leo C. Stein
The post-Newtonian calculation scheme applied to binary inspirals in a broad class of almost-GR theories.
We revisit a textbook example of a singularly perturbed nonlinear boundary-value problem. Unexpectedly, it shows a wealth of phenomena that seem to have ...
One of the important targets for the future space-based gravitational wave observatory LISA is extreme mass ratio inspirals (EMRIs), where long and accur...
We show that an eccentric binary of black holes with misaligned spins is integrable at 2PN order. We also construct 4 out of 5 action variables at 1.5PN.
Interactive toy for understanding Poincaré sections and chaos
Here are a few tips for making your matplotlib figures look really “right” in a LaTeX publication.
The ssh protocol is smart enough that you can open a control ‘master’ connection and reuse it to logically “connect” to the same machine as many times as you...
TL;DR For a single repo, add a special “refspec” for a remote (e.g. upstream): git config --add remote.upstream.fetch "+refs/pull/*/head:refs/pullreqs/*" wh...
Last week I gave an invited talk at the Spring 2020 workshop of the Black Hole Perturbation Toolkit (BHPToolkit). The BHPToolkit is a collection of open sou...
qnm is an open-source Python package for computing the Kerr quasinormal mode frequencies, angular separation constants, and spherical-spheroidal mixing coeff...
Accurate models of gravitational waves from merging black holes are necessary for detectors to observe as many events as possible while extracting the maximu...
Real-time interactive visualizations of merging black holes in seconds!
Modeling black holes remnants directly from numerical relativity
Modeling black holes’ kicks directly from numerical relativity
I’m releasing into the wild a simple code for computing neutron star structure in the slow-rotation expansion to first and second order. This code was origi...
Here to save you some algebra and column-inches
How to get remote jupyter to automatically open a local browser.
I just created a repo on github for computing complete elliptic integrals in javascript. The README.md is below, and a demo after that. You might ask yoursel...
If you’re in the intersection of git, emacs, and persnickety about whitespace.
That moment when social media creates scientific collaboration
I’m releasing into the wild a simple code for computing neutron star structure in the slow-rotation expansion to first and second order. This code was origi...
Not all theories with long-ranged scalar fields produce dipole radiation in binaries
A major review on non-GR theories, black holes and neutron stars in non-GR theories, compact binaries in non-GR theories, and pulsar, gravitational-wave, and...
The post-Newtonian calculation scheme applied to binary inspirals in a broad class of almost-GR theories.
We study the structure of asymptotic null infinity in the Brans-Dicke theory of gravity
Integrability conditions when trying to solve for a conformal factor
One of the key ingredients for making binary waveform predictions in a beyond-GR theory of gravity is understanding the energy and angular momentum carri...
So you have a function in terms of a continued fraction, and you want to compute its derivative…
One of the important targets for the future space-based gravitational wave observatory LISA is extreme mass ratio inspirals (EMRIs), where long and accur...
Accurate and efficient modeling of the dynamics of binary black holes (BBHs) is crucial to their detection through gravitational waves (GWs), with LIGO/V...
We revisit a textbook example of a singularly perturbed nonlinear boundary-value problem. Unexpectedly, it shows a wealth of phenomena that seem to have ...
Perturbation theory is a crucial tool for many physical systems, when exact solutions are not available, or nonperturbative numerical solutions are intra...
We show that an eccentric binary of black holes with misaligned spins is integrable at 2PN order. We also construct 4 out of 5 action variables at 1.5PN.
Interactive toy for understanding Poincaré sections and chaos
The dividing line between bound and plunging orbits is an algebraic variety
Interactive tool for visualizing spherical/circular photon orbits in Kerr
A generalization of symplectic integrators to non-conservative dynamics.
Extending Hamilton’s variational principle to nonconservative systems.
The post-Newtonian calculation scheme applied to binary inspirals in a broad class of almost-GR theories.
How to do the STF multipole expansion of the magnetic potential and field (it’s been on my TODO list for a while)
The ssh protocol is smart enough that you can open a control ‘master’ connection and reuse it to logically “connect” to the same machine as many times as you...
If you’re in the intersection of git, emacs, and persnickety about whitespace.
I am honored to have been selected as one of this year’s Sloan Research Fellows!
One of the key ingredients for making binary waveform predictions in a beyond-GR theory of gravity is understanding the energy and angular momentum carri...
Highly precise and robust waveform models are required as improvements in detector sensitivity enable us to test general relativity with more precision t...
Gravitational memory effects and the BMS freedoms exhibited at future null infinity have recently been resolved and utilized in numerical relativity simu...
We numerically investigate the imprints of gravitational radiation-reaction driven changes to a black hole’s mass and spin on the corresponding ringdown ...
In this short Note, I answer the titular question: Yes, a radiation gauge can be horizon-locking. Radiation gauges are very common in black hole perturbat...
Numerical relativity (NR) simulations of binary black holes provide precise waveforms, but are typically too computationally expensive to produce wavefor...
Our latest paper, Nonlinearities in black hole ringdowns, was just published in Physical Review Letters! This article was selected as an ❦ Editors’ Suggesti...
This article was selected as an ❦ Editors’ Suggestion, and Featured in APS’s Physics magazine. More press coverage links here.
The Bondi-van der Burg-Metzner-Sachs (BMS) group, which uniquely describes the symmetries of asymptotic infinity and therefore of the gravitational waves...
One of the important targets for the future space-based gravitational wave observatory LISA is extreme mass ratio inspirals (EMRIs), where long and accur...
Quasi-normal mode (QNM) modeling is an invaluable tool for characterizing remnant black holes, studying strong gravity, and testing general relativity. ...
Accurate and efficient modeling of the dynamics of binary black holes (BBHs) is crucial to their detection through gravitational waves (GWs), with LIGO/V...
Understanding the Bondi-Metzner-Sachs (BMS) frame of the gravitational waves produced by numerical relativity is crucial for ensuring that analyses on su...
We present a new study of remnant black hole properties from 13 binary black hole systems, numerically evolved using the Spectral Einstein Code. The mass...
We show that an eccentric binary of black holes with misaligned spins is integrable at 2PN order. We also construct 4 out of 5 action variables at 1.5PN.
Merger dynamics create an attractive fixed-point in the space of distributions
The generalized harmonic formulation can be derived by adding a gauge-fixing term to the Einstein-Hilbert action
The dividing line between bound and plunging orbits is an algebraic variety
qnm is an open-source Python package for computing the Kerr quasinormal mode frequencies, angular separation constants, and spherical-spheroidal mixing coeff...
Hear me, Katie Bouman, and friends talk about how to snap a picture of a black hole with the Event Horizon Telescope!
A surrogate model extending the parameter space range of fully precessing quasicircular inspirals
Accurate models of gravitational waves from merging black holes are necessary for detectors to observe as many events as possible while extracting the maximu...
I’m on Episode 42 of the Starts with a Bang Podcast
Want to hear me talk about numerical relativity and theories beyond GR?
Real-time interactive visualizations of merging black holes in seconds!
Modeling black holes remnants directly from numerical relativity
Gravity theories beyond general relativity (GR) can change the properties of gravitational waves: their polarizations, dispersion, speed, and, importantly, e...
The grand challenges of contemporary fundamental physics—dark matter, dark energy, vacuum energy, inflation and early universe cosmology, singularities an...
In theories of gravity that include a scalar field, a compact object’s scalar charge is a crucial quantity since it controls dipole radiation, which can be s...
Modeling black holes’ kicks directly from numerical relativity
Finding the shape of extremal black holes in beyond-GR theories
Whenever you’ve got symmetry, you should use it!
One of the first numerical simulations of black hole mergers in beyond-GR effective field theories
My talk slides/movies from the EHT16 conference in Cambrige, MA
I’m on Episode 64 of the Titanium Physicists Podcast
Interactive tool for visualizing spherical/circular photon orbits in Kerr
I hosted a Quora session. It went well!
Angular momentum is tricky to define in GR! Here’s an approach so that observers can all agree with each others’ measurements.
Invited review for CQG Focus Issue
I’m on Episode 62 of the Titanium Physicists Podcast
Not all theories with long-ranged scalar fields produce dipole radiation in binaries
Interactive tool to compute Kerr quantities
Interactive tool to compute ISCOs in Kerr
A major review on non-GR theories, black holes and neutron stars in non-GR theories, compact binaries in non-GR theories, and pulsar, gravitational-wave, and...
MIT PhD thesis of Leo C. Stein
In this short Note, I answer the titular question: Yes, a radiation gauge can be horizon-locking. Radiation gauges are very common in black hole perturbat...
Perturbation theory is a crucial tool for many physical systems, when exact solutions are not available, or nonperturbative numerical solutions are intra...
I haven’t been posting every time I gave a talk, so here is a sporadic update. I contributed a talk to the 2021 April APS meeting. This talk is a status u...
We study the structure of asymptotic null infinity in the Brans-Dicke theory of gravity
Integrability conditions when trying to solve for a conformal factor
Here to save you some algebra and column-inches
An identity between vector commutation coefficients and coframe connection coefficients
These three objects form a superalgebra! Whoa!
When can you integrate-by-parts with Lie derivatives?
Special thanks to Ben Mares for coming up with this identity.
There is a nice 4-dimensional Weyl identity that I can never seem to remember off the top of my head; so I decided I need to write this note so I don’t have ...
The Weyl decomposition, further splitting into E/B, and computing in terms of 3+1 objects
In an effort to keep myself organized, I decided I should type up some notes I have laying around.
Angular momentum is tricky to define in GR! Here’s an approach so that observers can all agree with each others’ measurements.
TL;DR For a single repo, add a special “refspec” for a remote (e.g. upstream): git config --add remote.upstream.fetch "+refs/pull/*/head:refs/pullreqs/*" wh...
If you’re in the intersection of git, emacs, and persnickety about whitespace.
I am honored to have been selected as one of this year’s Sloan Research Fellows!
Highly precise and robust waveform models are required as improvements in detector sensitivity enable us to test general relativity with more precision t...
Gravitational memory effects and the BMS freedoms exhibited at future null infinity have recently been resolved and utilized in numerical relativity simu...
We numerically investigate the imprints of gravitational radiation-reaction driven changes to a black hole’s mass and spin on the corresponding ringdown ...
Numerical relativity (NR) simulations of binary black holes provide precise waveforms, but are typically too computationally expensive to produce wavefor...
Numerical relativity simulations provide the most precise templates for the gravitational waves produced by binary black hole mergers. However, many of t...
We present a numerical-relativity simulation of a black hole - neutron star merger in scalar-tensor (ST) gravity with binary parameters consistent with t...
Our latest paper, Nonlinearities in black hole ringdowns, was just published in Physical Review Letters! This article was selected as an ❦ Editors’ Suggesti...
This article was selected as an ❦ Editors’ Suggestion, and Featured in APS’s Physics magazine. More press coverage links here.
The Bondi-van der Burg-Metzner-Sachs (BMS) group, which uniquely describes the symmetries of asymptotic infinity and therefore of the gravitational waves...
One of the key ingredients for making binary waveform predictions in a beyond-GR theory of gravity is understanding the energy and angular momentum carri...
One of the important targets for the future space-based gravitational wave observatory LISA is extreme mass ratio inspirals (EMRIs), where long and accur...
Quasi-normal mode (QNM) modeling is an invaluable tool for characterizing remnant black holes, studying strong gravity, and testing general relativity. ...
Understanding the Bondi-Metzner-Sachs (BMS) frame of the gravitational waves produced by numerical relativity is crucial for ensuring that analyses on su...
I haven’t been posting every time I gave a talk, so here is a sporadic update. I contributed a talk to the 2021 April APS meeting. This talk is a status u...
We present a new study of remnant black hole properties from 13 binary black hole systems, numerically evolved using the Spectral Einstein Code. The mass...
We perform a new test of general relativity (GR) with signals from GWTC-2, the LIGO and Virgo catalog of gravitational wave detections. We search for the...
We study the structure of asymptotic null infinity in the Brans-Dicke theory of gravity
Last week I gave an invited talk at the Spring 2020 workshop of the Black Hole Perturbation Toolkit (BHPToolkit). The BHPToolkit is a collection of open sou...
The first astrophysically-relevant numerical simulation of merging black holes in a higher-curvature theory beyond GR.
qnm is an open-source Python package for computing the Kerr quasinormal mode frequencies, angular separation constants, and spherical-spheroidal mixing coeff...
The first numerical beyond-GR binary black hole merger simulation.
Gravity theories beyond general relativity (GR) can change the properties of gravitational waves: their polarizations, dispersion, speed, and, importantly, e...
One of the first numerical simulations of black hole mergers in beyond-GR effective field theories
I hosted a Quora session. It went well!
Not all theories with long-ranged scalar fields produce dipole radiation in binaries
A major review on non-GR theories, black holes and neutron stars in non-GR theories, compact binaries in non-GR theories, and pulsar, gravitational-wave, and...
The post-Newtonian calculation scheme applied to binary inspirals in a broad class of almost-GR theories.
Highly precise and robust waveform models are required as improvements in detector sensitivity enable us to test general relativity with more precision t...
Gravitational memory effects and the BMS freedoms exhibited at future null infinity have recently been resolved and utilized in numerical relativity simu...
We numerically investigate the imprints of gravitational radiation-reaction driven changes to a black hole’s mass and spin on the corresponding ringdown ...
In this short Note, I answer the titular question: Yes, a radiation gauge can be horizon-locking. Radiation gauges are very common in black hole perturbat...
Numerical relativity (NR) simulations of binary black holes provide precise waveforms, but are typically too computationally expensive to produce wavefor...
Numerical relativity simulations provide the most precise templates for the gravitational waves produced by binary black hole mergers. However, many of t...
We present a numerical-relativity simulation of a black hole - neutron star merger in scalar-tensor (ST) gravity with binary parameters consistent with t...
Our latest paper, Nonlinearities in black hole ringdowns, was just published in Physical Review Letters! This article was selected as an ❦ Editors’ Suggesti...
This article was selected as an ❦ Editors’ Suggestion, and Featured in APS’s Physics magazine. More press coverage links here.
The Bondi-van der Burg-Metzner-Sachs (BMS) group, which uniquely describes the symmetries of asymptotic infinity and therefore of the gravitational waves...
One of the key ingredients for making binary waveform predictions in a beyond-GR theory of gravity is understanding the energy and angular momentum carri...
One of the important targets for the future space-based gravitational wave observatory LISA is extreme mass ratio inspirals (EMRIs), where long and accur...
Quasi-normal mode (QNM) modeling is an invaluable tool for characterizing remnant black holes, studying strong gravity, and testing general relativity. ...
Accurate and efficient modeling of the dynamics of binary black holes (BBHs) is crucial to their detection through gravitational waves (GWs), with LIGO/V...
Understanding the Bondi-Metzner-Sachs (BMS) frame of the gravitational waves produced by numerical relativity is crucial for ensuring that analyses on su...
I haven’t been posting every time I gave a talk, so here is a sporadic update. I contributed a talk to the 2021 April APS meeting. This talk is a status u...
We present a new study of remnant black hole properties from 13 binary black hole systems, numerically evolved using the Spectral Einstein Code. The mass...
We perform a new test of general relativity (GR) with signals from GWTC-2, the LIGO and Virgo catalog of gravitational wave detections. We search for the...
We show that an eccentric binary of black holes with misaligned spins is integrable at 2PN order. We also construct 4 out of 5 action variables at 1.5PN.
We study the structure of asymptotic null infinity in the Brans-Dicke theory of gravity
Merger dynamics create an attractive fixed-point in the space of distributions
Last week I gave an invited talk at the Spring 2020 workshop of the Black Hole Perturbation Toolkit (BHPToolkit). The BHPToolkit is a collection of open sou...
The first astrophysically-relevant numerical simulation of merging black holes in a higher-curvature theory beyond GR.
The dividing line between bound and plunging orbits is an algebraic variety
qnm is an open-source Python package for computing the Kerr quasinormal mode frequencies, angular separation constants, and spherical-spheroidal mixing coeff...
The first numerical beyond-GR binary black hole merger simulation.
A surrogate model extending the parameter space range of fully precessing quasicircular inspirals
Accurate models of gravitational waves from merging black holes are necessary for detectors to observe as many events as possible while extracting the maximu...
Real-time interactive visualizations of merging black holes in seconds!
Modeling black holes remnants directly from numerical relativity
Gravity theories beyond general relativity (GR) can change the properties of gravitational waves: their polarizations, dispersion, speed, and, importantly, e...
The grand challenges of contemporary fundamental physics—dark matter, dark energy, vacuum energy, inflation and early universe cosmology, singularities an...
In theories of gravity that include a scalar field, a compact object’s scalar charge is a crucial quantity since it controls dipole radiation, which can be s...
Modeling black holes’ kicks directly from numerical relativity
Finding the shape of extremal black holes in beyond-GR theories
Whenever you’ve got symmetry, you should use it!
One of the first numerical simulations of black hole mergers in beyond-GR effective field theories
MIT PhD thesis of Leo C. Stein
The post-Newtonian calculation scheme applied to binary inspirals in a broad class of almost-GR theories.
Gravitational memory effects and the BMS freedoms exhibited at future null infinity have recently been resolved and utilized in numerical relativity simu...
Perturbation theory is a crucial tool for many physical systems, when exact solutions are not available, or nonperturbative numerical solutions are intra...
Finding the shape of extremal black holes in beyond-GR theories
Whenever you’ve got symmetry, you should use it!
We revisit a textbook example of a singularly perturbed nonlinear boundary-value problem. Unexpectedly, it shows a wealth of phenomena that seem to have ...
Gravitational memory effects and the BMS freedoms exhibited at future null infinity have recently been resolved and utilized in numerical relativity simu...
Numerical relativity (NR) simulations of binary black holes provide precise waveforms, but are typically too computationally expensive to produce wavefor...
Numerical relativity simulations provide the most precise templates for the gravitational waves produced by binary black hole mergers. However, many of t...
One of the important targets for the future space-based gravitational wave observatory LISA is extreme mass ratio inspirals (EMRIs), where long and accur...
Accurate and efficient modeling of the dynamics of binary black holes (BBHs) is crucial to their detection through gravitational waves (GWs), with LIGO/V...
Perturbation theory is a crucial tool for many physical systems, when exact solutions are not available, or nonperturbative numerical solutions are intra...
We show that an eccentric binary of black holes with misaligned spins is integrable at 2PN order. We also construct 4 out of 5 action variables at 1.5PN.
Integrability conditions when trying to solve for a conformal factor
Interactive toy for understanding Poincaré sections and chaos
Real-time interactive visualizations of merging black holes in seconds!
Interactive toy for visualizing relationship between polynomial roots and coefficients
Interactive tool for visualizing spherical/circular photon orbits in Kerr
Interactive tool to compute Kerr quantities
Interactive tool to compute ISCOs in Kerr
How to get remote jupyter to automatically open a local browser.
How to get remote jupyter to automatically open a local browser.
I just created a repo on github for computing complete elliptic integrals in javascript. The README.md is below, and a demo after that. You might ask yoursel...
Last week I gave an invited talk at the Spring 2020 workshop of the Black Hole Perturbation Toolkit (BHPToolkit). The BHPToolkit is a collection of open sou...
How to get remote jupyter to automatically open a local browser.
If you’re in the intersection of git, emacs, and persnickety about whitespace.
We revisit a textbook example of a singularly perturbed nonlinear boundary-value problem. Unexpectedly, it shows a wealth of phenomena that seem to have ...
How to do the STF multipole expansion of the magnetic potential and field (it’s been on my TODO list for a while)
We present a numerical-relativity simulation of a black hole - neutron star merger in scalar-tensor (ST) gravity with binary parameters consistent with t...
We numerically investigate the imprints of gravitational radiation-reaction driven changes to a black hole’s mass and spin on the corresponding ringdown ...
Our latest paper, Nonlinearities in black hole ringdowns, was just published in Physical Review Letters! This article was selected as an ❦ Editors’ Suggesti...
This article was selected as an ❦ Editors’ Suggestion, and Featured in APS’s Physics magazine. More press coverage links here.
So you have a function in terms of a continued fraction, and you want to compute its derivative…
We revisit a textbook example of a singularly perturbed nonlinear boundary-value problem. Unexpectedly, it shows a wealth of phenomena that seem to have ...
Perturbation theory is a crucial tool for many physical systems, when exact solutions are not available, or nonperturbative numerical solutions are intra...
Highly precise and robust waveform models are required as improvements in detector sensitivity enable us to test general relativity with more precision t...
Gravitational memory effects and the BMS freedoms exhibited at future null infinity have recently been resolved and utilized in numerical relativity simu...
We numerically investigate the imprints of gravitational radiation-reaction driven changes to a black hole’s mass and spin on the corresponding ringdown ...
Numerical relativity (NR) simulations of binary black holes provide precise waveforms, but are typically too computationally expensive to produce wavefor...
Numerical relativity simulations provide the most precise templates for the gravitational waves produced by binary black hole mergers. However, many of t...
We present a numerical-relativity simulation of a black hole - neutron star merger in scalar-tensor (ST) gravity with binary parameters consistent with t...
Our latest paper, Nonlinearities in black hole ringdowns, was just published in Physical Review Letters! This article was selected as an ❦ Editors’ Suggesti...
This article was selected as an ❦ Editors’ Suggestion, and Featured in APS’s Physics magazine. More press coverage links here.
The Bondi-van der Burg-Metzner-Sachs (BMS) group, which uniquely describes the symmetries of asymptotic infinity and therefore of the gravitational waves...
Quasi-normal mode (QNM) modeling is an invaluable tool for characterizing remnant black holes, studying strong gravity, and testing general relativity. ...
Understanding the Bondi-Metzner-Sachs (BMS) frame of the gravitational waves produced by numerical relativity is crucial for ensuring that analyses on su...
We present a new study of remnant black hole properties from 13 binary black hole systems, numerically evolved using the Spectral Einstein Code. The mass...
The first astrophysically-relevant numerical simulation of merging black holes in a higher-curvature theory beyond GR.
The first numerical beyond-GR binary black hole merger simulation.
A surrogate model extending the parameter space range of fully precessing quasicircular inspirals
Accurate models of gravitational waves from merging black holes are necessary for detectors to observe as many events as possible while extracting the maximu...
Want to hear me talk about numerical relativity and theories beyond GR?
Hear me, Katie Bouman, and friends talk about how to snap a picture of a black hole with the Event Horizon Telescope!
I’m on Episode 42 of the Starts with a Bang Podcast
Want to hear me talk about numerical relativity and theories beyond GR?
I’m on Episode 64 of the Titanium Physicists Podcast
I hosted a Quora session. It went well!
I’m on Episode 62 of the Titanium Physicists Podcast
We numerically investigate the imprints of gravitational radiation-reaction driven changes to a black hole’s mass and spin on the corresponding ringdown ...
In this short Note, I answer the titular question: Yes, a radiation gauge can be horizon-locking. Radiation gauges are very common in black hole perturbat...
One of the important targets for the future space-based gravitational wave observatory LISA is extreme mass ratio inspirals (EMRIs), where long and accur...
We revisit a textbook example of a singularly perturbed nonlinear boundary-value problem. Unexpectedly, it shows a wealth of phenomena that seem to have ...
Perturbation theory is a crucial tool for many physical systems, when exact solutions are not available, or nonperturbative numerical solutions are intra...
I haven’t been posting every time I gave a talk, so here is a sporadic update. I contributed a talk to the 2021 April APS meeting. This talk is a status u...
We show that an eccentric binary of black holes with misaligned spins is integrable at 2PN order. We also construct 4 out of 5 action variables at 1.5PN.
Last week I gave an invited talk at the Spring 2020 workshop of the Black Hole Perturbation Toolkit (BHPToolkit). The BHPToolkit is a collection of open sou...
qnm is an open-source Python package for computing the Kerr quasinormal mode frequencies, angular separation constants, and spherical-spheroidal mixing coeff...
Finding the shape of extremal black holes in beyond-GR theories
Whenever you’ve got symmetry, you should use it!
One of the first numerical simulations of black hole mergers in beyond-GR effective field theories
MIT PhD thesis of Leo C. Stein
The post-Newtonian calculation scheme applied to binary inspirals in a broad class of almost-GR theories.
Hear me, Katie Bouman, and friends talk about how to snap a picture of a black hole with the Event Horizon Telescope!
I’m on Episode 42 of the Starts with a Bang Podcast
I’m on Episode 64 of the Titanium Physicists Podcast
I’m on Episode 62 of the Titanium Physicists Podcast
Interactive toy for visualizing relationship between polynomial roots and coefficients
Gravitational memory effects and the BMS freedoms exhibited at future null infinity have recently been resolved and utilized in numerical relativity simu...
Numerical relativity (NR) simulations of binary black holes provide precise waveforms, but are typically too computationally expensive to produce wavefor...
The Bondi-van der Burg-Metzner-Sachs (BMS) group, which uniquely describes the symmetries of asymptotic infinity and therefore of the gravitational waves...
Accurate and efficient modeling of the dynamics of binary black holes (BBHs) is crucial to their detection through gravitational waves (GWs), with LIGO/V...
We show that an eccentric binary of black holes with misaligned spins is integrable at 2PN order. We also construct 4 out of 5 action variables at 1.5PN.
The post-Newtonian calculation scheme applied to binary inspirals in a broad class of almost-GR theories.
Not all theories with long-ranged scalar fields produce dipole radiation in binaries
A major review on non-GR theories, black holes and neutron stars in non-GR theories, compact binaries in non-GR theories, and pulsar, gravitational-wave, and...
Here are a few tips for making your matplotlib figures look really “right” in a LaTeX publication.
Highly precise and robust waveform models are required as improvements in detector sensitivity enable us to test general relativity with more precision t...
So you have a function in terms of a continued fraction, and you want to compute its derivative…
Last week I gave an invited talk at the Spring 2020 workshop of the Black Hole Perturbation Toolkit (BHPToolkit). The BHPToolkit is a collection of open sou...
qnm is an open-source Python package for computing the Kerr quasinormal mode frequencies, angular separation constants, and spherical-spheroidal mixing coeff...
Real-time interactive visualizations of merging black holes in seconds!
Modeling black holes remnants directly from numerical relativity
Modeling black holes’ kicks directly from numerical relativity
I missed the author index from LRR, so I rebuilt one.
How to get remote jupyter to automatically open a local browser.
I hosted a Quora session. It went well!
How to get remote jupyter to automatically open a local browser.
Perturbation theory is a crucial tool for many physical systems, when exact solutions are not available, or nonperturbative numerical solutions are intra...
Highly precise and robust waveform models are required as improvements in detector sensitivity enable us to test general relativity with more precision t...
We numerically investigate the imprints of gravitational radiation-reaction driven changes to a black hole’s mass and spin on the corresponding ringdown ...
Our latest paper, Nonlinearities in black hole ringdowns, was just published in Physical Review Letters! This article was selected as an ❦ Editors’ Suggesti...
This article was selected as an ❦ Editors’ Suggestion, and Featured in APS’s Physics magazine. More press coverage links here.
Quasi-normal mode (QNM) modeling is an invaluable tool for characterizing remnant black holes, studying strong gravity, and testing general relativity. ...
The first astrophysically-relevant numerical simulation of merging black holes in a higher-curvature theory beyond GR.
qnm is an open-source Python package for computing the Kerr quasinormal mode frequencies, angular separation constants, and spherical-spheroidal mixing coeff...
The first numerical beyond-GR binary black hole merger simulation.
Interactive toy for visualizing relationship between polynomial roots and coefficients
Here are a few tips for making your matplotlib figures look really “right” in a LaTeX publication.
So you have a function in terms of a continued fraction, and you want to compute its derivative…
qnm is an open-source Python package for computing the Kerr quasinormal mode frequencies, angular separation constants, and spherical-spheroidal mixing coeff...
I’m releasing into the wild a simple code for computing neutron star structure in the slow-rotation expansion to first and second order. This code was origi...
How to get remote jupyter to automatically open a local browser.
We revisit a textbook example of a singularly perturbed nonlinear boundary-value problem. Unexpectedly, it shows a wealth of phenomena that seem to have ...
We revisit a textbook example of a singularly perturbed nonlinear boundary-value problem. Unexpectedly, it shows a wealth of phenomena that seem to have ...
I hosted a Quora session. It went well!
That moment when social media creates scientific collaboration
Sometimes in a numerical method, you need to be able to continuously turn a calculation on or off in space or time.
I just created a repo on github for computing complete elliptic integrals in javascript. The README.md is below, and a demo after that. You might ask yoursel...
The ssh protocol is smart enough that you can open a control ‘master’ connection and reuse it to logically “connect” to the same machine as many times as you...
How to get remote jupyter to automatically open a local browser.
Gravity theories beyond general relativity (GR) can change the properties of gravitational waves: their polarizations, dispersion, speed, and, importantly, e...
These three objects form a superalgebra! Whoa!
Highly precise and robust waveform models are required as improvements in detector sensitivity enable us to test general relativity with more precision t...
Numerical relativity simulations provide the most precise templates for the gravitational waves produced by binary black hole mergers. However, many of t...
Merger dynamics create an attractive fixed-point in the space of distributions
A surrogate model extending the parameter space range of fully precessing quasicircular inspirals
Modeling black holes remnants directly from numerical relativity
Modeling black holes’ kicks directly from numerical relativity
The Bondi-van der Burg-Metzner-Sachs (BMS) group, which uniquely describes the symmetries of asymptotic infinity and therefore of the gravitational waves...
Quasi-normal mode (QNM) modeling is an invaluable tool for characterizing remnant black holes, studying strong gravity, and testing general relativity. ...
Understanding the Bondi-Metzner-Sachs (BMS) frame of the gravitational waves produced by numerical relativity is crucial for ensuring that analyses on su...
I haven’t been posting every time I gave a talk, so here is a sporadic update. I contributed a talk to the 2021 April APS meeting. This talk is a status u...
We present a new study of remnant black hole properties from 13 binary black hole systems, numerically evolved using the Spectral Einstein Code. The mass...
In theories of gravity that include a scalar field, a compact object’s scalar charge is a crucial quantity since it controls dipole radiation, which can be s...
Finding the shape of extremal black holes in beyond-GR theories
Whenever you’ve got symmetry, you should use it!
How to do the STF multipole expansion of the magnetic potential and field (it’s been on my TODO list for a while)
In theories of gravity that include a scalar field, a compact object’s scalar charge is a crucial quantity since it controls dipole radiation, which can be s...
How to get remote jupyter to automatically open a local browser.
That moment when social media creates scientific collaboration
Here are a few tips for making your matplotlib figures look really “right” in a LaTeX publication.
Real-time interactive visualizations of merging black holes in seconds!
Want to hear me talk about numerical relativity and theories beyond GR?
Here to save you some algebra and column-inches
There is a nice 4-dimensional Weyl identity that I can never seem to remember off the top of my head; so I decided I need to write this note so I don’t have ...
I missed the author index from LRR, so I rebuilt one.