Gravity theories beyond general relativity (GR) can change the properties of gravitational waves: their polarizations, dispersion, speed, and, importantly, e...
Posts by YearBrowse by: Category Tags Year
Black hole scalar charge from a topological horizon integral in Einstein-dilaton-Gauss-Bonnet gravity
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...
Integrability conditions when trying to solve for a conformal factor
Modeling black holes’ kicks directly from numerical relativity
Finding the shape of extremal black holes in beyond-GR theories
Interactive toy for visualizing relationship between polynomial roots and coefficients
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...
I missed the author index from LRR, so I rebuilt one.
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...
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
An identity between vector commutation coefficients and coframe connection coefficients
These three objects form a superalgebra! Whoa!
How to get remote jupyter to automatically open a local browser.
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 ...
My talk slides/movies from TG17 and APS17
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.
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
Just one more committee
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
That moment when social media creates scientific collaboration
Progress in understanding the structure of extremal black holes in Chern-Simons
The monster topical review has finally been published!
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
If you’re in the intersection of git, emacs, and persnickety about whitespace.
I’m back in Pasadena!
A generalization of symplectic integrators to non-conservative dynamics.
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...
Extending Hamilton’s variational principle to nonconservative systems.
Explaining why universality emerges in compact objects.
Rapidly Rotating Black Holes in Dynamical Chern-Simons Gravity: Decoupling Limit Solutions and Breakdown
Numerical solutions for rapidly-rotating dCS black holes show where the weak-coupling expansion breaks down.
Short note simplifying a calculation in the literature.
Universal relations between the Newtonian multipole moments of rotating stars.
Connecting observables (pulsar binary pericenter precession and gravitational wave phase) to the parameters and structure of theoretical models.
Chern-Simons corrections to 1) internal structure (including mass shift) and 2) binary dynamics (including pericenter precession) of neutron stars.
The post-Newtonian calculation scheme applied to binary inspirals in a broad class of almost-GR theories.
Applying symplectic geometry to understand and refine Hamiltonian MC.
Parametrizing deviations from purely GR, vacuum black holes.
The deformation to spherically symmetric black holes under a class of corrections to general relativity.
Computing how much energy and momentum gravitational waves carry in a very broad class of almost-GR theories.
Turning an O(n^2) problem into an O(n log n) problem in radio interferometry, similar in spirit to how the fast Fourier transform operates.
Autonomous gravitational-wave searches—fully automated analyses of data that run without human intervention or assistance—are desirable for a number of re...
Coherent Network Analysis Technique for Discriminating Gravitational-wave Bursts From Instrumental Noise
How to overconstrain the problem of discriminating gravitational wave signals from detector noise and glitches.