K. G. Arun
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View article: Confronting general relativity with principal component analysis: Simulations and results from GWTC-3 events
Confronting general relativity with principal component analysis: Simulations and results from GWTC-3 events Open
We present a comprehensive assessment of multiparameter tests of general relativity (GR) in the inspiral regime of compact binary coalescences using principal component analysis (PCA). Our analysis is based on an extensive set of simulated…
View article: Tests of general relativity with GWTC-3
Tests of general relativity with GWTC-3 Open
https://journals.aps.org/prd/accepted/17075Qf4Z7b11729787e85f1c18faca230d51e013
View article: GW241011 and GW241110: Exploring Binary Formation and Fundamental Physics with Asymmetric, High-spin Black Hole Coalescences
GW241011 and GW241110: Exploring Binary Formation and Fundamental Physics with Asymmetric, High-spin Black Hole Coalescences Open
We report the observation of gravitational waves from two binary black hole coalescences during the fourth observing run of the LIGO–Virgo–KAGRA detector network, GW241011 and GW241110. The sources of these two signals are characterized by…
View article: GW231123: A Binary Black Hole Merger with Total Mass 190–265 <i>M</i> <sub>⊙</sub>
GW231123: A Binary Black Hole Merger with Total Mass 190–265 <i>M</i> <sub>⊙</sub> Open
On 2023 November 23, the two LIGO observatories both detected GW231123, a gravitational-wave signal consistent with the merger of two black holes with masses and (90% credible intervals), at a luminosity dis…
View article: Testing the nature of compact objects in the lower mass gap using gravitational wave observations
Testing the nature of compact objects in the lower mass gap using gravitational wave observations Open
As the compact binary catalog continues to grow rapidly, developing and refining tests to probe the nature of compact objects is essential for a comprehensive understanding of both the observed data and the underlying astrophysics of the b…
View article: All-sky search for long-duration gravitational-wave transients in the first part of the fourth LIGO-Virgo-KAGRA Observing run
All-sky search for long-duration gravitational-wave transients in the first part of the fourth LIGO-Virgo-KAGRA Observing run Open
We present an all-sky search for long-duration gravitational waves (GWs) from the first part of the LIGO-Virgo-KAGRA fourth observing run (O4), called O4a and comprising data taken between 24 May 2023 and 16 January 2024. The GW signals ta…
View article: Identifying intermediate mass binary black hole mergers in AGN disks using LISA
Identifying intermediate mass binary black hole mergers in AGN disks using LISA Open
We show that Laser Interferometer Space Antenna can uniquely identify the sites of intermediate-mass binary black hole (IMBBH) mergers if they occur in Active Galactic Nuclei (AGN) disks with a gas density $\rho\geq10^{-12} \, {\rm g/cc}$ …
View article: Possible causes of false general relativity violations in gravitational wave observations
Possible causes of false general relativity violations in gravitational wave observations Open
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 weak gravity, low relative speeds, and linear regimes, but a…
View article: Gravitational physics in the context of Indian astronomy: A vision document
Gravitational physics in the context of Indian astronomy: A vision document Open
View article: Reconstructing the Genealogy of LIGO-Virgo Black Holes
Reconstructing the Genealogy of LIGO-Virgo Black Holes Open
We propose a Bayesian inference framework to predict the merger history of LIGO-Virgo binary black holes (BHs), whose binary components may have undergone hierarchical mergers in the past. The framework relies on numerical relativity predi…
View article: Diversity in Fermi/GBM Gamma-Ray Bursts: New Insights from Machine Learning
Diversity in Fermi/GBM Gamma-Ray Bursts: New Insights from Machine Learning Open
Classification of gamma-ray bursts (GRBs) has been a long-standing puzzle in high-energy astrophysics. Recent observations challenge the traditional short versus long viewpoint, where long GRBs are thought to originate from the collapse of…
View article: Search for Eccentric Black Hole Coalescences during the Third Observing Run of LIGO and Virgo
Search for Eccentric Black Hole Coalescences during the Third Observing Run of LIGO and Virgo Open
Despite the growing number of binary black hole coalescences confidently observed through gravitational waves so far, the astrophysical origin of these binaries remains uncertain. Orbital eccentricity is one of the clearest tracers of bina…
View article: Characterizing gravitational wave detector networks: from A<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msup><mml:mrow/><mml:mo>♯</mml:mo></mml:msup></mml:mrow></mml:math>to cosmic explorer
Characterizing gravitational wave detector networks: from Ato cosmic explorer Open
Gravitational-wave observations by the laser interferometer gravitational-wave observatory (LIGO) and Virgo have provided us a new tool to explore the Universe on all scales from nuclear physics to the cosmos and have the massive potential…
View article: Parametrized tests of general relativity using eccentric compact binaries
Parametrized tests of general relativity using eccentric compact binaries Open
Astrophysical population simulations predict that a subset of dynamically formed binary black holes (BBHs) may possess eccentricity $\gtrsim 0.1$ at a gravitational wave (GW) frequency of $10 \,\text{Hz}$. Presently, the LIGO-Virgo-KAGRA (…
View article: Ultralight vector dark matter search using data from the KAGRA O3GK run
Ultralight vector dark matter search using data from the KAGRA O3GK run Open
Among the various candidates for dark matter (DM), ultralight vector DM can be probed by laser interferometric gravitational wave detectors through the measurement of oscillating length changes in the arm cavities. In this context, KAGRA h…
View article: Observation of Gravitational Waves from the Coalescence of a 2.5–4.5 M <sub>⊙</sub> Compact Object and a Neutron Star
Observation of Gravitational Waves from the Coalescence of a 2.5–4.5 M <sub>⊙</sub> Compact Object and a Neutron Star Open
We report the observation of a coalescing compact binary with component masses 2.5–4.5 M ⊙ and 1.2–2.0 M ⊙ (all measurements quoted at the 90% credible level). The gravitational-wave signal GW230529_181500 was observed during the fourth ob…
View article: Reconstructing the Genealogy of LIGO-Virgo Black Holes
Reconstructing the Genealogy of LIGO-Virgo Black Holes Open
We propose a Bayesian inference framework to predict the merger history of LIGO-Virgo binary black holes (BHs), whose binary components may have undergone hierarchical mergers in the past. The framework relies on numerical relativity predi…
View article: A Joint Fermi-GBM and Swift-BAT Analysis of Gravitational-wave Candidates from the Third Gravitational-wave Observing Run
A Joint Fermi-GBM and Swift-BAT Analysis of Gravitational-wave Candidates from the Third Gravitational-wave Observing Run Open
We present Fermi Gamma-ray Burst Monitor (Fermi-GBM) and Swift Burst Alert Telescope (Swift-BAT) searches for gamma-ray/X-ray counterparts to gravitational-wave (GW) candidate events identified during the third observing run of the Advance…
View article: Ultralight vector dark matter search using data from the KAGRA O3GK run
Ultralight vector dark matter search using data from the KAGRA O3GK run Open
Among the various candidates for dark matter (DM), ultralight vector DM can be probed by laser interferometric gravitational wave detectors through the measurement of oscillating length changes in the arm cavities. In this context, KAGRA h…
View article: Multiparameter tests of general relativity using a principle component analysis with next-generation gravitational-wave detectors
Multiparameter tests of general relativity using a principle component analysis with next-generation gravitational-wave detectors Open
Principal component analysis (PCA) is an efficient tool to optimize multiparameter tests of general relativity (GR), wherein one looks for simultaneous deviations in multiple post-Newtonian phasing coefficients. This is accomplished by int…
View article: GWTC-2.1: Deep extended catalog of compact binary coalescences observed by LIGO and Virgo during the first half of the third observing run
GWTC-2.1: Deep extended catalog of compact binary coalescences observed by LIGO and Virgo during the first half of the third observing run Open
The second Gravitational-Wave Transient Catalog, GWTC-2, reported on 39 compact binary coalescences observed by the Advanced LIGO and Advanced Virgo detectors between 1 April 2019 15:00 UTC and 1 October 2019 15:00 UTC. Here, we present GW…
View article: Constraining the p-Mode-g-Mode Tidal Instability with GW170817
Constraining the p-Mode-g-Mode Tidal Instability with GW170817 Open
We analyze the impact of a proposed tidal instability coupling p modes and g modes within neutron stars on GW170817. This nonresonant instability transfers energy from the orbit of the binary to internal modes of the stars, accelerating th…
View article: GW170104: Observation of a 50-Solar-Mass Binary Black Hole Coalescence at Redshift 0.2
GW170104: Observation of a 50-Solar-Mass Binary Black Hole Coalescence at Redshift 0.2 Open
We describe the observation of GW170104, a gravitational-wave signal produced by the coalescence of a pair of stellar-mass black holes. The signal was measured on January 4, 2017 at 10∶11:58.6 UTC by the twin advanced detectors of the Lase…
View article: Multiparameter multipolar test of general relativity with gravitational waves
Multiparameter multipolar test of general relativity with gravitational waves Open
Amplitude and phase of the gravitational waveform from compact binary systems can be decomposed in terms of their mass- and current-type multipole moments. In a modified theory of gravity, one or more of these multipole moments could devia…
View article: GWTC-3: Compact Binary Coalescences Observed by LIGO and Virgo during the Second Part of the Third Observing Run
GWTC-3: Compact Binary Coalescences Observed by LIGO and Virgo during the Second Part of the Third Observing Run Open
Plenary Talk presented at the XX International Workshop on Neutrino Telescopes - Venice 23-27 October 2023
View article: Search for merger ejecta emission from late-time radio observations of short GRBs using GMRT
Search for merger ejecta emission from late-time radio observations of short GRBs using GMRT Open
In some cases, the merger of two neutron stars can produce a rapidly rotating and highly magnetized millisecond magnetar. A significant proportion of the rotational energy deposited to the emerging ejecta can produce a late-time radio brig…
View article: Eccentricity-induced systematic error on parametrized tests of general relativity: Hierarchical Bayesian inference applied to a binary black hole population
Eccentricity-induced systematic error on parametrized tests of general relativity: Hierarchical Bayesian inference applied to a binary black hole population Open
One approach to testing general relativity (GR) introduces free parameters in the post-Newtonian (PN) expansion of the gravitational-wave (GW) phase. If systematic errors on these testing GR (TGR) parameters exceed the statistical errors, …
View article: Effect of double spin-precession and higher harmonics on spin-induced quadrupole moment measurements
Effect of double spin-precession and higher harmonics on spin-induced quadrupole moment measurements Open
We investigate the prospect of performing a null test of binary black hole (BBH) nature using spin-induced quadrupole moment (SIQM) measurements. This is achieved by constraining a deviation parameter ($δκ$) related to the parameter ($κ$) …
View article: Correction to: Search for subsolar-mass black hole binaries in the second part of Advanced LIGO's and Advanced Virgo's third observing run
Correction to: Search for subsolar-mass black hole binaries in the second part of Advanced LIGO's and Advanced Virgo's third observing run Open
We describe a search for gravitational waves from compact binaries with at\nleast one component with mass 0.2 $M_\\odot$ -- $1.0 M_\\odot$ and mass ratio $q\n\\geq 0.1$ in Advanced LIGO and Advanced Virgo data collected between 1 November\…
View article: Search for Gravitational Waves Associated with Fast Radio Bursts Detected by CHIME/FRB during the LIGO–Virgo Observing Run O3a
Search for Gravitational Waves Associated with Fast Radio Bursts Detected by CHIME/FRB during the LIGO–Virgo Observing Run O3a Open
We search for gravitational-wave (GW) transients associated with fast radio bursts (FRBs) detected by the Canadian Hydrogen Intensity Mapping Experiment Fast Radio Burst Project, during the first part of the third observing run of Advanced…