129 citations · 491 across the 32 of their papers we have counts for
30 papers · 1 filter
Including higher-order modes in a quadrupolar eccentric numerical relativity surrogate using universal eccentric modulation functions
Tousif Islam, Adhrit Ravichandran, Peter James Nee +15
\texttt{gwNRHME} is a framework that converts multi-modal (i.e., containing several spherical harmonic modes) quasi-circular waveforms into their eccentric counterparts, provided t…
Analysis of late-time tails in spin-aligned eccentric binary black hole mergers
Tousif Islam, Guglielmo Faggioli, Gaurav Khanna
We present a comprehensive analysis of late-time tails in gravitational radiation from merging spin-aligned eccentric binary black holes, using high-accuracy point-particle black h…
Eccentric binary black holes: A new framework for numerical relativity waveform surrogates
Peter James Nee, Adhrit Ravichandran, Scott E. Field +17
Mounting evidence indicates that some of the gravitational wave signals observed by the LIGO/Virgo/KAGRA observatories might arise from eccentric compact object binaries, increasin…
Consistency of spin effects between numerical relativity and perturbation theory for inspiraling comparable-mass black hole binaries
Tousif Islam, Gaurav Khanna, Scott E. Field
Numerical relativity (NR) provides the most accurate waveforms for comparable-mass binary black holes but becomes prohibitively expensive for increasingly asymmetric mass ratios. P…
The SXS Collaboration's third catalog of binary black hole simulations
Mark A. Scheel, Michael Boyle, Keefe Mitman +56
We present a major update to the Simulating eXtreme Spacetimes (SXS) Collaboration's catalog of binary black hole simulations. Using highly efficient spectral methods implemented i…
Gravitational waves from black hole emission
Tousif Islam, Gaurav Khanna, Steven L. Liebling
Using adiabatic point-particle black hole perturbation theory, we simulate plausible gravitational wave~(GW) signatures in two exotic scenarios (i) where a small black hole is emit…
Gravitational wave surrogate model for spinning, intermediate mass ratio binaries based on perturbation theory and numerical relativity
Katie Rink, Ritesh Bachhar, Tousif Islam +6
We present BHPTNRSur2dq1e3, a reduced order surrogate model of gravitational waves emitted from binary black hole (BBH) systems in the comparable to large mass ratio regime with al…
Phenomenology and origin of late-time tails in eccentric binary black hole mergers
Tousif Islam, Guglielmo Faggioli, Gaurav Khanna +3
We investigate the late-time tail behavior in gravitational waves from merging eccentric binary black holes (BBH) using black hole perturbation theory. For simplicity, we focus onl…
Mapping between black-hole perturbation theory and numerical relativity II: gravitational-wave momentum
Tousif Islam
We report an approximate, non-trivial mapping of angular (linear) momentum in gravitational waves obtained from numerical relativity (NR) and adiabatic point-particle black hole pe…
Comparing numerical relativity and perturbation theory waveforms for a non-spinning equal-mass binary
Tousif Islam, Scott E. Field, Gaurav Khanna
Past studies have empirically demonstrated a surprising agreement between gravitational waveforms computed using adiabatic-driven-inspiral point-particle black hole perturbation th…
Mapping between black-hole perturbation theory and numerical relativity: gravitational-wave energy flux
Tousif Islam
We investigate the - mapping, as previously introduced by Islam et al.~\cite{Islam:2022laz}, which relates numerical relativity (NR) and adiabatic point-particle black hole p…
Analysis of GWTC-3 with fully precessing numerical relativity surrogate models
Tousif Islam, Avi Vajpeyi, Feroz H. Shaik +6
The third Gravitational-Wave Transient Catalog (GWTC-3) contains 90 binary coalescence candidates detected by the LIGO-Virgo-KAGRA Collaboration (LVK). We provide a re-analysis of…
On the approximate relation between black-hole perturbation theory and numerical relativity
Tousif Islam, Gaurav Khanna
We investigate the interplay between numerical relativity (NR) and adiabatic point-particle black hole perturbation theory (ppBHPT) in the comparable mass regime for quasi-circular…
Interplay between numerical-relativity and black hole perturbation theory in the intermediate-mass-ratio regime
Tousif Islam
We investigate the interplay between numerical relativity (NR) and point-particle black hole perturbation theory (ppBHPT) for quasi-circular non-spinning binary black holes in the…
Interplay between numerical relativity and perturbation theory : finite size effects
Tousif Islam, Gaurav Khanna
We investigate the interplay between numerical relativity (NR) and point-particle black hole perturbation theory (ppBHPT) in the comparable mass ratio regime. In the ppBHPT framewo…
Remnant black hole properties from numerical-relativity-informed perturbation theory and implications for waveform modelling
Tousif Islam, Scott E. Field, Gaurav Khanna
During binary black hole (BBH) mergers, energy and momenta are carried away from the binary system as gravitational radiation. Access to the radiated energy and momenta allows us t…
White dwarf mass-radius relation in theories beyond general relativity
Khursid Alam, Tousif Islam
We explore the internal structures of the white dwarfs in two different modified theories of gravity: (i) scalar-tensor-vector gravity and (ii) beyond Horndeski theories of t…
Factorized Parameter Estimation for Real-Time Gravitational Wave Inference
Tousif Islam, Javier Roulet, Tejaswi Venumadhav
We present a parameter estimation framework for gravitational wave (GW) signals that brings together several ideas to accelerate the inference process. First, we use the relative b…
Removing degeneracy and multimodality in gravitational wave source parameters
Javier Roulet, Seth Olsen, Jonathan Mushkin +4
Quasicircular binary black hole mergers are described by 15 parameters, of which gravitational wave observations can typically constrain only independent combinations to…
Surrogate model for gravitational wave signals from non-spinning, comparable- to large-mass-ratio black hole binaries built on black hole perturbation theory waveforms calibrated to numerical relativity
Tousif Islam, Scott E. Field, Scott A. Hughes +6
We present a reduced-order surrogate model of gravitational waveforms from non-spinning binary black hole systems with comparable to large mass-ratio configurations. This surrogate…
Applying higher-modes consistency test on GW190814 : lessons on no-hair theorem, nature of the secondary compact object and waveform modeling
Tousif Islam
As one of the consequences of the black-hole "no-hair" theorem in general relativity (GR), the multipolar structure of the radiation (i.e. different spherical harmonic modes) from…
Survey of gravitational wave memory in intermediate mass ratio binaries
Tousif Islam, Scott E. Field, Gaurav Khanna +1
The non-linear gravitational wave (GW) memory effect is a distinct prediction in general relativity. While the effect has been well studied for comparable mass binaries, it has mos…
High-precision source characterization of intermediate mass-ratio black hole coalescences with gravitational waves: The importance of higher-order multipoles
Tousif Islam, Scott E. Field, Carl-Johan Haster +1
Intermediate mass ratio inspiral (IMRI) binaries -- containing stellar-mass black holes coalescing into intermediate-mass black holes () -- are a highly anticipated…
Eccentric binary black hole surrogate models for the gravitational waveform and remnant properties: comparable mass, nonspinning case
Tousif Islam, Vijay Varma, Jackie Lodman +6
We develop new strategies to build numerical relativity surrogate models for eccentric binary black hole systems, which are expected to play an increasingly important role in curre…