81 citations · 491 across the 22 of their papers we have counts for
22 papers · 1 filter
Tidal Excitation of Relativistic Stars
Zhiqiang Miao, Junquan Su, Neev Khera +1
How a relativistic star responds to a time-dependent tide has lacked a first-principles counterpart of the Newtonian normal-mode expansion. In general relativity, the tidal field i…
From the Test-Mass Limit to Binary Black-Hole Waveforms in Higher-Derivative Gravity
Chaoyi Yang, Neev Khera, Dongjun Li +1
Many higher-derivative theories predict stronger deviations from General Relativity for lower-mass black holes, while their nonlinear field equations often prevent reliable simulat…
Gravitational Waves from Green's Function Decomposition for a Kerr black hole: I. Equatorial ISCO Plunge
Junquan Su, Neev Khera, Abhishek Chowdhuri +2
We present a decomposition of the Kerr Green's function in the time domain, motivated by the frequency-domain split previously studied in the Schwarzschild limit. We show that the…
Modified Teukolsky Formalism for Extreme Mass-Ratio Inspirals in Higher-Derivative Gravity
Chaoyi Yang, Neev Khera, Dongjun Li +1
In this work, we study a model problem involving a point particle spiraling into a non-rotating black hole in higher-derivative theories of gravity. In such theories, both the back…
A nonlinear voice from GW250114 ringdown
Yi-Fan Wang, Sizheng Ma, Neev Khera +2
Gravitational-wave astronomy, by detecting ripples in spacetime, has opened a new window to observe compact objects and probe theories of gravity in the nonlinear strong-field regi…
Decomposition of Schwarzschild Green's Function
Junquan Su, Neev Khera, Marc Casals +3
We present a formulation of the spherically decomposed Green's function for a Schwarzschild black hole, based on a decomposition into two components, and , based on thei…
From spatial to null infinity: Connecting initial data to peeling
Berend Schneider, Neev Khera
The asymptotic structure of space-time is studied by imposing conditions on the asymptotics of the metric. These conditions are weak enough to include large classes of physically r…
Quadratic Mode Couplings in Rotating Black Holes and Their Detectability
Neev Khera, Sizheng Ma, Huan Yang
Quadratic quasinormal modes encode fundamental properties of black hole spacetimes. They are also one of the key ingredients of nonlinearities of General Relativity in the ringdown…
Unified Treatment of null and Spatial Infinity IV: Angular Momentum at Null and Spatial Infinity
Abhay Ashtekar, Neev Khera
In a companion paper we introduced the notion of asymptotically Minkowski spacetimes. These space-times are asymptotically flat at both null and spatial infinity, and furthermore t…
Unified Treatment of Null and Spatial Infinity III: Asymptotically Minkowski Space-times
Abhay Ashtekar, Neev Khera
The Spi framework provides a 4-dimensional approach to investigate the asymptotic properties of gravitational fields as one recedes from isolated systems in any space-like directio…
Nonlinear ringdown at the black hole horizon
Neev Khera, Ariadna Ribes Metidieri, Béatrice Bonga +6
The gravitational waves emitted by a perturbed black hole ringing down are well described by damped sinusoids, whose frequencies are those of quasinormal modes. Typically, first-or…
Multipole moments on the common horizon in a binary-black-hole simulation
Yitian Chen, Prayush Kumar, Neev Khera +8
We construct the covariantly defined multipole moments on the common horizon of an equal-mass, non-spinning, quasicircular binary-black-hole system. We see a strong correlation bet…
Charges and Fluxes on (Perturbed) Non-expanding Horizons
Abhay Ashtekar, Neev Khera, Maciej Kolanowski +1
In a companion paper we showed that the symmetry group of non-expanding horizons (NEHs) is a 1-dimensional extension of the Bondi-Metzner-Sachs group …
Non-Expanding horizons: Multipoles and the Symmetry Group
Abhay Ashtekar, Neev Khera, Maciej Kolanowski +1
It is well-known that blackhole and cosmological horizons in equilibrium situations are well-modeled by non-expanding horizons (NEHs). In the first part of the paper we introduce m…
High Precision Ringdown Modeling: Multimode Fits and BMS Frames
Lorena Magaña Zertuche, Keefe Mitman, Neev Khera +12
Quasi-normal mode (QNM) modeling is an invaluable tool for characterizing remnant black holes, studying strong gravity, and testing GR. Only recently have QNM studies begun to focu…
Testing gravitational waveform models using angular momentum
Neev Khera, Abhay Ashtekar, Badri Krishnan
The anticipated enhancements in detector sensitivity and the corresponding increase in the number of gravitational wave detections will make it possible to estimate parameters of c…
Fixing the BMS Frame of Numerical Relativity Waveforms
Keefe Mitman, Neev Khera, Dante A. B. Iozzo +9
Understanding the Bondi-Metzner-Sachs (BMS) frame of the gravitational waves produced by numerical relativity is crucial for ensuring that analyses on such waveforms are performed…
Comparing Remnant Properties from Horizon Data and Asymptotic Data in Numerical Relativity
Dante A. B. Iozzo, Neev Khera, Leo C. Stein +10
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, spin, and recoil velocity…
Adding Gravitational Memory to Waveform Catalogs using BMS Balance Laws
Keefe Mitman, Dante A. B. Iozzo, Neev Khera +9
Accurate models of gravitational waves from merging binary black holes are crucial for detectors to measure events and extract new science. One important feature that is currently…
Inferring the gravitational wave memory for binary coalescence events
Neev Khera, Badri Krishnan, Abhay Ashtekar +1
Full, non-linear general relativity predicts a memory effect for gravitational waves. For compact binary coalescence, the total gravitational memory serves as an inferred observabl…
Compact binary coalescences: The subtle issue of angular momentum
Abhay Ashtekar, Tommaso De Lorenzo, Neev Khera
In presence of gravitational radiation, the notion of angular momentum of an isolated system acquires an infinite dimensional supertranslation ambiguity. This fact has been emphasi…
Compact binary coalescences: Constraints on waveforms
Abhay Ashtekar, Tommaso De Lorenzo, Neev Khera
Gravitational waveforms for compact binary coalescences (CBCs) have been invaluable for detections by the LIGO-Virgo collaboration. They are obtained by a combination of semi-analy…