465 citations · 1.8k across the 39 of their papers we have counts for
31 papers · 1 filter
Efficient time-domain eccentric model for Galactic binaries in LISA
Shubhanshu Tiwari, Johan O. A. Robertsson, A. Gopakumar +4
Galactic binaries are expected to be the most numerous long-lived sources in the Laser Interferometer Space Antenna (LISA) data stream and are commonly modeled as quasi-circular, n…
Testing general relativity with amplitudes of subdominant gravitational-wave modes
Ish Gupta, Purnima Narayan, Lionel London +2
We present an improved subdominant-mode amplitude (SMA) test of general relativity (GR), which probes amplitude-level deviations in the higher-order modes of gravitational-wave (GW…
Optimizing searches for gravitational wave bursts using coherent WaveBurst 2G
Alessandro Martini, Andrea Miani, Marco Drago +11
The most general searches for gravitational wave transients (GWTs) rely on data analysis methods that do not assume prior knowledge of the signal waveform, direction, or arrival ti…
Search for dynamical black hole captures with Gaussian mixture modelling
Leigh Smith, Shubhanshu Tiwari, Michael Ebersold +3
Gravitational waves (GWs) are expected to originate from black holes interacting dynamically in dense astrophysical environments. In such environments, given that the velocity and…
Quadrupolar power radiation by a binary system in a hyperbolic encounter on de Sitter background
Michael Blanc, Philippe Jetzer, Shubhanshu Tiwari
The present cosmological model and the surveys favor the universe with a small but positive cosmological constant , which accounts for dark energy and causes an exponential expa…
Measuring gravitational wave memory with LISA
Henri Inchauspé, Silvia Gasparotto, Diego Blas +3
Gravitational wave (GW) astronomy has revolutionized our capacity to explore nature. The next generation of observatories, among which the space-borne detector Laser Interferometer…
Detectability of eccentric binary black holes with PyCBC and cWB pipelines during the third observing run of LIGO-Virgo-KAGRA
Bhooshan Gadre, Kanchan Soni, Shubhanshu Tiwari +3
Detecting binary black hole (BBH) mergers with quantifiable orbital eccentricity would confirm the existence of a dynamical formation channel for these binaries. The current state-…
Possible Causes of False General Relativity Violations in Gravitational Wave Observations
Anuradha Gupta, K. G. Arun, Enrico Barausse +40
General relativity (GR) has proven to be a highly successful theory of gravity since its inception. The theory has thrivingly passed numerous experimental tests, predominantly in w…
Enhancing Gravitational Wave Parameter Estimation with Non-Linear Memory: Breaking the Distance-Inclination Degeneracy
Yumeng Xu, Maria Rosselló-Sastre, Shubhanshu Tiwari +5
In this study, we investigate the role of the non-linear memory effect in gravitational wave (GW) parameter estimation, particularly we explore its capability to break the degenera…
Search for hyperbolic encounters of compact objects in the third LIGO-Virgo-KAGRA observing run
Sophie Bini, Shubhanshu Tiwari, Yumeng Xu +6
Gravitational-wave (GW) observations provide unique information about compact objects. As detectors sensitivity increases, new astrophysical sources of GW could emerge. Close hyper…
PycWB: A User-friendly, Modular, and Python-based Framework for Gravitational Wave Unmodelled Search
Yumeng Xu, Shubhanshu Tiwari, Marco Drago
Unmodelled searches and reconstruction is a critical aspect of gravitational wave data analysis, requiring sophisticated software tools for robust data analysis. This paper introdu…
Gravitational Waves from Black-Hole Encounters: Prospects for Ground- and Galaxy-Based Observatories
Subhajit Dandapat, Michael Ebersold, Abhimanyu Susobhanan +6
Close hyperbolic encounters of black holes (BHs) generate certain Burst With Memory (BWM) events in the frequency windows of the operational, planned, and proposed gravitational wa…
Gravitational wave memory of compact binary coalescence in the presence of matter effects
Dixeena Lopez, Shubhanshu Tiwari, Michael Ebersold
Binary neutron stars (BNSs) and neutron star--black hole (NSBH) binaries are two of the most promising gravitational wave (GW) sources to probe matter effects. Upcoming observing r…
Constraints on the amplitude of gravitational wave echoes from black hole ring-down using minimal assumptions
Andrea Miani, Claudia Lazzaro, Giovanni Andrea Prodi +4
Gravitational wave echoes may appear following a compact binary coalescence if the remnant is an "exotic compact object" (ECO). ECOs are proposed alternatives to the black holes of…
Search for gravitational-wave bursts in the third Advanced LIGO-Virgo run with coherent WaveBurst enhanced by Machine Learning
Marek J. Szczepańczyk, Francesco Salemi, Sophie Bini +13
This paper presents a search for generic short-duration gravitational-wave (GW) transients (or GW bursts) in the data from the third observing run of Advanced LIGO and Advanced Vir…
Observational limits on the rate of radiation-driven binary black hole capture events
Michael Ebersold, Shubhanshu Tiwari, Leigh Smith +6
Dense astrophysical environments like globular clusters and galactic nuclei can host hyperbolic encounters of black holes which can lead to gravitational-wave driven capture. There…
Addressing the challenges of detecting time-overlapping compact binary coalescences
Philip Relton, Andrea Virtuoso, Sophie Bini +6
Standard detection and analysis techniques for transient gravitational waves make the assumption that detector data contains, at most, one signal at any time. As detectors improve…
Series expansion of the overlap reduction function for scalar and vector polarizations for gravitational wave search with pulsar timing arrays
Adrian Boîtier, Tanguy Giroud, Shubhanshu Tiwari +1
In our previous work \cite{PTA2} we calculated the overlap reduction function for the tensor polarization without employing the short wavelength approximation, this was done by obt…
Leveraging gravitational-wave memory to distinguish neutron star--black hole binaries from black hole binaries
Shubhanshu Tiwari, Michael Ebersold, Eleanor Z. Hamilton
In the observation of gravitational waves (GWs) from a compact binary coalescence system where the mass of one of the companions is the nature of the object is a…
All-sky search in early O3 LIGO data for continuous gravitational-wave signals from unknown neutron stars in binary systems
The LIGO Scientific Collaboration, the Virgo Collaboration, R. Abbott +1369
Rapidly spinning neutron stars are promising sources of persistent, continuous gravitational waves. Detecting such a signal would allow probing of the physical properties of matter…
Analytic series expansion of the overlap reduction function for gravitational wave search with pulsar timing arrays
Adrian Boîtier, Shubhanshu Tiwari, Philippe Jetzer
In our previous paper \cite{PTA1} we derived a generic expression for the pulse redshift the main observable for the Pulsar Timing Array (PTA) experiment for detection of gravitati…
Pulse redshift of pulsar timing array signals for all possible gravitational wave polarizations in modified general relativity
Adrian Boîtier, Shubhanshu Tiwari, Lionel Philippoz +1
Pulsar timing arrays (PTA) have the promise to detect gravitational waves (GWs) from sources which are in a unique frequency range of 10^-9 - 10^-6 Hz. This in turn also provides a…
Coherent WaveBurst, a pipeline for unmodeled gravitational-wave data analysis
M. Drago, V. Gayathri, S. Klimenko +12
coherent WaveBurst (cWB) is a highly configurable pipeline designed to detect a broad range of gravitational-wave (GW) transients in the data of the worldwide network of GW detecto…
Impact of eccentricity on the gravitational wave searches for binary black holes: High mass case
Antoni Ramos-Buades, Shubhanshu Tiwari, Maria Haney +1
The possible formation of stellar-mass binary black holes through dynamical interactions in dense stellar environments predicts the existence of binaries with non-negligible eccent…