A. Vijaykumar
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View article: Implications of GW241011 for rotating exotic compact objects
Implications of GW241011 for rotating exotic compact objects Open
A number of theoretical proposals have been made for horizonless compact objects with masses and spins similar to those of black holes. While gravitational wave signatures from their mergers can resemble those of black holes, features like…
View article: Hierarchical Triples vs. Globular Clusters: Binary black hole merger eccentricity distributions compete and evolve with redshift
Hierarchical Triples vs. Globular Clusters: Binary black hole merger eccentricity distributions compete and evolve with redshift Open
The formation mechanisms of merging binary black holes (BBHs) observed by the LIGO-Virgo-KAGRA collaboration remain uncertain. Detectable eccentricity provides a powerful diagnostic for distinguishing between different formation channels, …
View article: Inference with finite time series: II. The window strikes back
Inference with finite time series: II. The window strikes back Open
Smooth window functions are often applied to strain data when inferring the parameters describing the astrophysical sources of gravitational-wave transients. Within the LIGO-Virgo-KAGRA collaboration, it is conventional to include a term t…
View article: Evidence of the pair instability gap in the distribution of black hole masses
Evidence of the pair instability gap in the distribution of black hole masses Open
Stellar theory predicts a forbidden range of black-hole masses between ${\sim}50$--$130\,M_\odot$ due to pair-instability supernovae, but evidence for such a gap in the mass distribution from gravitational-wave astronomy has proved elusive…
View article: Hierarchical Triples vs. Globular Clusters: Binary black hole merger eccentricity distributions compete and evolve with redshift
Hierarchical Triples vs. Globular Clusters: Binary black hole merger eccentricity distributions compete and evolve with redshift Open
The formation mechanisms of merging binary black holes (BBHs) observed by the LIGO-Virgo-KAGRA collaboration remain uncertain. Detectable eccentricity provides a powerful diagnostic for distinguishing between different formation channels, …
View article: A pipeline to search for signatures of line-of-sight acceleration in gravitational wave signals produced by compact binary coalescences
A pipeline to search for signatures of line-of-sight acceleration in gravitational wave signals produced by compact binary coalescences Open
Compact binary coalescences (CBCs), such as merging binary black holes (BBHs), binary neutron stars (BNSs), or neutron star black holes (NSBHs), hosted by dense stellar environments, could produce gravitational waves (GWs) that contain sig…
View article: Two-axis diffractive laser beam steering with digital micromirror devices and compact optical relay
Two-axis diffractive laser beam steering with digital micromirror devices and compact optical relay Open
View article: Gravitational-wave Dark Siren Cosmology Systematics from Galaxy Weighting
Gravitational-wave Dark Siren Cosmology Systematics from Galaxy Weighting Open
The detection of GW170817 and the measurement of its redshift from the associated electromagnetic counterpart provided the first gravitational-wave (GW) determination of the Hubble constant ( H 0 ), demonstrating the potential power of sta…
View article: Assessing the potential of LIGO-India in resolving the Hubble Tension
Assessing the potential of LIGO-India in resolving the Hubble Tension Open
Determining the Hubble constant (H0), a fundamental parameter describing cosmic expansion, remains a challenge due to conflicting measurements from the early and late universe. Gravitational wave (GW) observations from binary neutron star …
View article: Inferring Host-galaxy Properties of LIGO–Virgo–KAGRA’s Black Holes
Inferring Host-galaxy Properties of LIGO–Virgo–KAGRA’s Black Holes Open
Observations of gravitational waves from binary black hole (BBH) mergers have measured the redshift evolution of the BBH merger rate. The number density of galaxies in the Universe evolves differently with redshift based on their physical …
View article: Impact of Higher Harmonics of Gravitational Radiation on the Population Inference of Binary Black Holes
Impact of Higher Harmonics of Gravitational Radiation on the Population Inference of Binary Black Holes Open
Templates modeling just the dominant mode of gravitational radiation are generally sufficient for the unbiased parameter inference of near-equal-mass compact binary mergers. However, neglecting the subdominant modes can bias the inference …
View article: Profiling stellar environments of gravitational wave sources
Profiling stellar environments of gravitational wave sources Open
Gravitational waves (GWs) have enabled direct detections of compact binary coalescences (CBCs). However, their poor sky localisation and the typical lack of observable electromagnetic (EM) counterparts make it difficult to confidently iden…
View article: Consistent Eccentricities for Gravitational-wave Astronomy: Resolving Discrepancies between Astrophysical Simulations and Waveform Models
Consistent Eccentricities for Gravitational-wave Astronomy: Resolving Discrepancies between Astrophysical Simulations and Waveform Models Open
Detecting imprints of orbital eccentricity in gravitational-wave (GW) signals promises to shed light on the formation mechanisms of binary black holes. To constrain the formation mechanisms, distributions of eccentricity derived from numer…
View article: Gravitational-wave dark siren cosmology systematics from galaxy weighting
Gravitational-wave dark siren cosmology systematics from galaxy weighting Open
The detection of GW170817 and the measurement of its redshift from the associated electromagnetic counterpart provided the first gravitational wave determination of the Hubble constant ($H_0$), demonstrating the potential power of standard…
View article: Bounds on the charge of the graviton using gravitational wave observations
Bounds on the charge of the graviton using gravitational wave observations Open
If the graviton possesses a non-zero charge $q_g$, gravitational waves (GW) originating from astrophysical sources would experience an additional time delay due to intergalactic magnetic fields. This would result in a modification of the p…
View article: Consistent eccentricities for gravitational wave astronomy: Resolving discrepancies between astrophysical simulations and waveform models
Consistent eccentricities for gravitational wave astronomy: Resolving discrepancies between astrophysical simulations and waveform models Open
Detecting imprints of orbital eccentricity in GW signals promises to shed light on the formation mechanisms of binary black holes. To constrain formation mechanisms, distributions of eccentricity derived from numerical simulations of astro…
View article: Impact of higher harmonics of gravitational radiation on the population inference of binary black holes
Impact of higher harmonics of gravitational radiation on the population inference of binary black holes Open
Templates modeling just the dominant mode of gravitational radiation are generally sufficient for the unbiased parameter inference of near-equal-mass compact binary mergers. However, neglecting the subdominant modes can bias the inference …
View article: Accelerated parameter estimation in Bilby with relative binning
Accelerated parameter estimation in Bilby with relative binning Open
We describe an implementation of the relative binning technique to speed up parameter estimation of gravitational-wave signals. We first give a pedagogical overview of relative binning, discussing also the expressions for the likelihood ma…
View article: Inferring host-galaxy properties of LIGO-Virgo-KAGRA's black holes
Inferring host-galaxy properties of LIGO-Virgo-KAGRA's black holes Open
Observations of gravitational waves from binary black hole (BBH) mergers have measured the redshift evolution of the BBH merger rate. The number density of galaxies in the Universe evolves differently with redshift based on their physical …
View article: Accelerated binary black holes in globular clusters: forecasts and detectability in the era of space-based gravitational-wave detectors
Accelerated binary black holes in globular clusters: forecasts and detectability in the era of space-based gravitational-wave detectors Open
The motion of the centre of mass of a coalescing binary black hole (BBH) in a gravitational potential, imprints a line-of-sight acceleration (LOSA) on to the emitted gravitational-wave (GW) signal. The acceleration could be sufficiently la…
View article: Probing the large scale structure using gravitational-wave observations of binary black holes
Probing the large scale structure using gravitational-wave observations of binary black holes Open
Third generation gravitational-wave (GW) detectors are expected to detect a large number of binary black holes (BBHs) to large redshifts, opening up an independent probe of the large scale structure using their clustering. This probe will …
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: Waltzing Binaries: Probing the Line-of-sight Acceleration of Merging Compact Objects with Gravitational Waves
Waltzing Binaries: Probing the Line-of-sight Acceleration of Merging Compact Objects with Gravitational Waves Open
The line-of-sight acceleration of a compact binary coalescence (CBC) event would modulate the shape of the gravitational waves (GWs) it produces with respect to the corresponding nonaccelerated CBC. Such modulations could be indicative of …
View article: Probing lens-induced gravitational-wave birefringence as a test of general relativity
Probing lens-induced gravitational-wave birefringence as a test of general relativity Open
Theories beyond general relativity (GR) modify the propagation of gravitational waves (GWs). In some, inhomogeneities (aka, gravitational lenses) allow interactions between the metric and additional fields to cause lens-induced birefringen…
View article: Accelerated binary black holes in globular clusters: forecasts and detectability in the era of space-based gravitational-wave detectors
Accelerated binary black holes in globular clusters: forecasts and detectability in the era of space-based gravitational-wave detectors Open
The motion of the center of mass of a coalescing binary black hole (BBH) in a gravitational potential imprints a line-of-sight acceleration (LOSA) onto the emitted gravitational wave (GW) signal. The acceleration could be sufficiently larg…
View article: Waltzing binaries: Probing line-of-sight acceleration of merging compact objects with gravitational waves
Waltzing binaries: Probing line-of-sight acceleration of merging compact objects with gravitational waves Open
Line-of-sight acceleration of a compact binary coalescence (CBC) event would modulate the shape of the gravitational waves (GWs) it produces with respect to the corresponding non-accelerated CBC. Such modulations could be indicative of its…
View article: Rapid Identification and Classification of Eccentric Gravitational Wave Inspirals with Machine Learning
Rapid Identification and Classification of Eccentric Gravitational Wave Inspirals with Machine Learning Open
Current templated searches for gravitational waves (GWs) emanated from compact binary coalescences (CBCs) assume that the binaries have circularized by the time they enter the sensitivity band of the LIGO-Virgo-KAGRA (LVK) network. However…
View article: Probing lens-induced gravitational-wave birefringence as a test of general relativity
Probing lens-induced gravitational-wave birefringence as a test of general relativity Open
Theories beyond general relativity (GR) modify the propagation of gravitational waves (GWs). In some, inhomogeneities (aka. gravitational lenses) allow interactions between the metric and additional fields to cause lens-induced birefringen…
View article: Impact of updated Multipole Love numbers and f-Love Universal Relations in the context of Binary Neutron Stars
Impact of updated Multipole Love numbers and f-Love Universal Relations in the context of Binary Neutron Stars Open
Neutron star (NS) equation of state (EoS) insensitive relations or universal relations (UR) involving neutron star bulk properties play a crucial role in gravitational-wave astronomy. Considering a wide range of equations of state originat…
View article: Detecting Baryon Acoustic Oscillations with Third-generation Gravitational Wave Observatories
Detecting Baryon Acoustic Oscillations with Third-generation Gravitational Wave Observatories Open
We explore the possibility of detecting baryon acoustic oscillations (BAO) solely from gravitational wave (GW) observations of binary neutron star mergers with third-generation (3G) GW detectors such as the Cosmic Explorer and the Einstein…