258 citations · 2.1k across the 33 of their papers we have counts for
24 papers · 1 filter
Relativistic perturbation theory for black-hole boson clouds
Enrico Cannizzaro, Laura Sberna, Stephen R. Green +1
We develop a relativistic perturbation theory for scalar clouds around rotating black holes. We first introduce a relativistic product and corresponding orthogonality relation betw…
Adapting to noise distribution shifts in flow-based gravitational-wave inference
Jonas Wildberger, Maximilian Dax, Stephen R. Green +5
Deep learning techniques for gravitational-wave parameter estimation have emerged as a fast alternative to standard samplers $\unicode{x2013}$ producing results of comparable accur…
Conserved currents for Kerr and orthogonality of quasinormal modes
Stephen R. Green, Stefan Hollands, Laura Sberna +2
We introduce a bilinear form for Weyl scalar perturbations of Kerr. The form is symmetric and conserved, and we show that, when combined with a suitable renormalization prescriptio…
Neural Importance Sampling for Rapid and Reliable Gravitational-Wave Inference
Maximilian Dax, Stephen R. Green, Jonathan Gair +5
We combine amortized neural posterior estimation with importance sampling for fast and accurate gravitational-wave inference. We first generate a rapid proposal for the Bayesian po…
Using machine learning to parametrize postmerger signals from binary neutron stars
Tim Whittaker, William E. East, Stephen R. Green +2
There is growing interest in the detection and characterization of gravitational waves from postmerger oscillations of binary neutron stars. These signals contain information about…
Nonlinear effects in the black hole ringdown: absorption-induced mode excitation
Laura Sberna, Pablo Bosch, William E. East +2
Gravitational-wave observations of black hole ringdowns are commonly used to characterize binary merger remnants and to test general relativity. These analyses assume linear black…
New metric reconstruction scheme for gravitational self-force calculations
Vahid Toomani, Peter Zimmerman, Andrew Spiers +3
Inspirals of stellar-mass objects into massive black holes will be important sources for the space-based gravitational-wave detector LISA. Modelling these systems requires calculat…
Real-time gravitational-wave science with neural posterior estimation
Maximilian Dax, Stephen R. Green, Jonathan Gair +3
We demonstrate unprecedented accuracy for rapid gravitational-wave parameter estimation with deep learning. Using neural networks as surrogates for Bayesian posterior distributions…
Excited hairy black holes: dynamical construction and level transitions
Pablo Bosch, Stephen R. Green, Luis Lehner +1
We study the dynamics of unstable Reissner-Nordström anti-de Sitter black holes under charged scalar field perturbations in spherical symmetry. We unravel their general behavior an…
Teukolsky formalism for nonlinear Kerr perturbations
Stephen R. Green, Stefan Hollands, Peter Zimmerman
We develop a formalism to treat higher order (nonlinear) metric perturbations of the Kerr spacetime in a Teukolsky framework. We first show that solutions to the linearized Einstei…
Extended I-Love relations for slowly rotating neutron stars
Jérémie Gagnon-Bischoff, Stephen R. Green, Philippe Landry +1
Observations of gravitational waves from inspiralling neutron star binaries---such as GW170817---can be used to constrain the nuclear equation of state by placing bounds on stellar…
A Simple, Heuristic Derivation of our "No Backreaction" Results
Stephen R. Green, Robert M. Wald
We provide a simple discussion of our results on the backreaction effects of density inhomogeneities in cosmology, without mentioning one-parameter families or weak limits. Emphasi…
Nonlinear Evolution and Final Fate of Charged Anti-de Sitter Black Hole Superradiant Instability
Pablo Bosch, Stephen R. Green, Luis Lehner
We describe the full nonlinear development of the superradiant instability for a charged massless scalar field, coupled to general relativity and electromagnetism, in the vicinity…
Superradiant instabilities of asymptotically anti-de Sitter black holes
Stephen R. Green, Stefan Hollands, Akihiro Ishibashi +1
We study the linear stability of asymptotically anti-de Sitter black holes in general relativity in spacetime dimension . Our approach is an adaptation of the general framew…
Islands of stability and recurrence times in AdS
Stephen R. Green, Antoine Maillard, Luis Lehner +1
We study the stability of anti-de Sitter (AdS) spacetime to spherically symmetric perturbations of a real scalar field in general relativity. Further, we work within the context of…
Reply to "Comment on two-mode stability islands around AdS"
Alex Buchel, Stephen R. Green, Luis Lehner +1
We respond to the criticisms of a recent comment by Bizoń and Rostworowski [arXiv:1410.2631].
Comments on Backreaction
Stephen R. Green, Robert M. Wald
We respond to the criticisms of a recent paper of Buchert et al. [arXiv:1505.07800]
Coupled Oscillator Model for Nonlinear Gravitational Perturbations
Huan Yang, Fan Zhang, Stephen R. Green +1
Motivated by the gravity/fluid correspondence, we introduce a new method for characterizing nonlinear gravitational interactions. Namely we map the nonlinear perturbative form of t…
Conserved quantities and dual turbulent cascades in Anti-de Sitter spacetime
Alex Buchel, Stephen R. Green, Luis Lehner +1
We consider the dynamics of a spherically symmetric massless scalar field coupled to general relativity in Anti--de Sitter spacetime in the small-amplitude limit. Within the contex…
How well is our universe described by an FLRW model?
Stephen R. Green, Robert M. Wald
Extremely well! In the CDM model, the spacetime metric, , of our universe is approximated by an FLRW metric, , to about 1 part in or better on both…
Dynamic and Thermodynamic Stability of Relativistic, Perfect Fluid Stars
Stephen R. Green, Joshua S. Schiffrin, Robert M. Wald
We consider perfect fluid bodies (stars) in general relativity, characterized by particle number density and entropy per particle. A star is said to be in dynamic equilibrium if it…
Examples of backreaction of small scale inhomogeneities in cosmology
Stephen R. Green, Robert M. Wald
In previous work, we introduced a new framework to treat large scale backreaction effects due to small scale inhomogeneities in general relativity. We considered one-parameter fami…
Newtonian and Relativistic Cosmologies
Stephen R. Green, Robert M. Wald
Cosmological N-body simulations are now being performed using Newtonian gravity on scales larger than the Hubble radius. It is well known that a uniformly expanding, homogeneous ba…
A new framework for analyzing the effects of small scale inhomogeneities in cosmology
Stephen R. Green, Robert M. Wald
We develop a new, mathematically precise framework for treating the effects of nonlinear phenomena occurring on small scales in general relativity. Our approach is an adaptation of…