140 citations · 1.3k across the 31 of their papers we have counts for
31 papers
Radial Mode Stability of Two-Fluid Neutron Stars
Daniel A. Caballero, Justin L. Ripley, Nicolás Yunes
Radial mode stability is a necessary condition for the astrophysical viability of compact objects. In recent years, astrophysical models with two fluids have gain popularity, espec…
Dissipative tidal effects to next-to-leading order and constraints on the dissipative tidal deformability using gravitational wave data
Abhishek Hegade K. R., Justin L. Ripley, Nicolás Yunes
Dissipative tidal interactions can be used to probe the out-of-equilibrium physics of neutron stars using gravitational wave observations. In this paper, we present the first post-…
Nonlinear effect of absorption on the ringdown of a spinning black hole
Taillte May, Sizheng Ma, Justin L. Ripley +1
The ringdown gravitational wave signal arising e.g., in the final stage of a black hole binary merger, contains important information about the properties of the remnant, and can p…
Dynamical tidal response of non-rotating relativistic stars
Abhishek Hegade K. R., Justin L. Ripley, Nicolás Yunes
Accurately modeling the tidal response of neutron stars is crucial to connecting gravitational wave observations of binaries to ultra-dense nuclear physics. Most current models of…
Nonlinear Effects In Black Hole Ringdown From Scattering Experiments I: spin and initial data dependence of quadratic mode coupling
Hengrui Zhu, Justin L. Ripley, Frans Pretorius +13
We investigate quadratic quasinormal mode coupling in black hole spacetime through numerical simulations of single perturbed black holes using both numerical relativity and second-…
First constraint on the dissipative tidal deformability of neutron stars
Justin L. Ripley, Abhishek Hegade K. R., Rohit S. Chandramouli +1
The gravitational waves (GWs) emitted by neutron star binaries probe the physics of matter at supra nuclear densities. During the late inspiral, tidal deformations raised on each s…
Challenges in Quasinormal Mode Extraction: Perspectives from Numerical solutions to the Teukolsky Equation
Hengrui Zhu, Justin L. Ripley, Alejandro Cárdenas-Avendaño +1
The intricacies of black hole ringdown analysis are amplified by the absence of a complete set of orthogonal basis functions for quasinormal modes. Although damped sinusoids effect…
Spin dependence of black hole ringdown nonlinearities
Jaime Redondo-Yuste, Gregorio Carullo, Justin L. Ripley +2
The nonlinear character of general relativity leaves its imprint in the coalescence of two black holes, from the inspiral to the final ringdown stage. To quantify the impact of non…
The non-relativistic limit of first-order relativistic viscous fluids
Abhishek Hegade K R, Justin L. Ripley, Nicolás Yunes
Out-of-equilibrium effects may play an important role in the dynamics of neutron star mergers and in heavy-ion collisions. Bemfica, Disconzi, Noronha and Kovtun (BDNK) recently der…
Probing internal dissipative processes of neutron stars with gravitational waves during the inspiral of neutron star binaries
Justin L. Ripley, Abhishek Hegade K. R., Nicolas Yunes
We study the impact of out-of-equilibrium, dissipative effects on the dynamics of inspiraling neutron stars. We find that modeling dissipative processes (such as those from the sta…
Measuring the ringdown scalar polarization of gravitational waves in Einstein scalar Gauss-Bonnet gravity
Tamara Evstafyeva, Michalis Agathos, Justin L. Ripley
We model the scalar waves produced during the ringdown stage of binary black hole coalescence in Einstein scalar Gauss-Bonnet (EsGB) gravity, using numerical relativity simulations…
Where and why does Einstein-Scalar-Gauss-Bonnet theory break down?
Abhishek Hegade K R, Justin L. Ripley, Nicolás Yunes
We present a systematic exploration of the loss of predictivity in Einstein-scalar-Gauss-Bonnet (ESGB) gravity. We first formulate a gauge covariant method of characterizing the br…
Nonlinear studies of binary black hole mergers in Einstein-scalar-Gauss-Bonnet gravity
Maxence Corman, Justin L. Ripley, William E. East
We study the nonlinear dynamics of binary black hole systems with scalar charge by numerically evolving the full equations of motion for shift-symmetric Einstein scalar Gauss-Bonne…
Numerical relativity for Horndeski gravity
Justin L. Ripley
We present an overview of recent developments in the numerical solution of Horndeski gravity theories, which are the class of all scalar-tensor theories of gravity that have second…
Dynamics of a nonminimally coupled scalar field in asymptotically spacetime
Alex Pandya, Justin L. Ripley
We numerically investigate the stability of four-dimensional asymptotically anti-de Sitter () spacetime for a class of nonminimally coupled scalar field theories. In particu…
Computing the quasinormal modes and eigenfunctions for the Teukolsky equation using horizon penetrating, hyperboloidally compactified coordinates
Justin L. Ripley
We study the quasinormal mode eigenvalues and eigenfunctions for the Teukolsky equation in a horizon penetrating, hyperboloidally compactified (HPHC) coordinate system. Following e…
GRChombo: An adaptable numerical relativity code for fundamental physics
Tomas Andrade, Llibert Areste Salo, Josu C. Aurrekoetxea +29
GRChombo is an open-source code for performing Numerical Relativity time evolutions, built on top of the publicly available Chombo software for the solution of PDEs. Whilst GRChomb…
Lessons for adaptive mesh refinement in numerical relativity
Miren Radia, Ulrich Sperhake, Amelia Drew +7
We demonstrate the flexibility and utility of the Berger-Rigoutsos Adaptive Mesh Refinement (AMR) algorithm used in the open-source numerical relativity code GRChombo for generatin…
A symmetric hyperbolic formulation of the vacuum Einstein equations in affine-null coordinates
Justin L. Ripley
We present a symmetric hyperbolic formulation of the Einstein equations in affine-null coordinates. Giannakopoulos et. al. (arXiv:2007.06419) recently showed that the most commonly…
Dynamics of spontaneous black hole scalarization and mergers in Einstein-scalar-Gauss-Bonnet gravity
William E. East, Justin L. Ripley
We study the dynamics of black holes in Einstein-scalar-Gauss-Bonnet theories that exhibit spontaneous black hole scalarization using recently introduced methods for solving the fu…
Evolution of Einstein-scalar-Gauss-Bonnet gravity using a modified harmonic formulation
William E. East, Justin L. Ripley
We present numerical solutions of several spacetimes of physical interest, including binary black hole mergers, in shift-symmetric Einstein-scalar-Gauss-Bonnet (ESGB) gravity, and…
Numerical computation of second order vacuum perturbations of Kerr black holes
Justin L. Ripley, Nicholas Loutrel, Elena Giorgi +1
Motivated by the desire to understand the leading order nonlinear gravitational wave interactions around arbitrarily rapidly rotating Kerr black holes, we describe a numerical code…
Second Order Perturbations of Kerr Black Holes: Reconstruction of the Metric
Nicholas Loutrel, Justin L. Ripley, Elena Giorgi +1
Motivated by gravitational wave observations of binary black hole mergers, we present a procedure to compute the leading order nonlinear gravitational wave interactions around a Ke…
Dynamics of a Z2 symmetric EdGB gravity in spherical symmetry
Justin L. Ripley, Frans Pretorius
We report on a numerical investigation of black hole evolution in an Einstein dilaton Gauss-Bonnet (EdGB) gravity theory where the Gauss-Bonnet coupling and scalar (dilaton) field…