S. Kumar
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View article: Parameter Estimation with Nonstationary Noise in Gravitational-wave Data
Parameter Estimation with Nonstationary Noise in Gravitational-wave Data Open
The sensitivity of gravitational-wave (GW) detectors is characterized by their noise curves, which determine the detector’s reach and ability to measure the parameters of astrophysical sources accurately. The detector noise is typically mo…
View article: Accounting for the Known Unknowns: A Parametric Framework to Incorporate Systematic Waveform Errors in Gravitational-Wave Parameter Estimation
Accounting for the Known Unknowns: A Parametric Framework to Incorporate Systematic Waveform Errors in Gravitational-Wave Parameter Estimation Open
The PE for GW merger events relies on a waveform model calibrated using numerical simulations. Within the Bayesian framework, this waveform model represents the GW signal produced during the merger and is crucial for estimating the likelih…
View article: Optomechanically induced transparency/absorption in a 3D microwave cavity architecture at ambient temperature
Optomechanically induced transparency/absorption in a 3D microwave cavity architecture at ambient temperature Open
Leveraging advancements in cavity optomechanics, we explore Optomechanically Induced Transparency/Absorption (OMIT/OMIA) in the microwave domain at ambient temperature. Contrary to previous studies employing cryogenic temperatures, this wo…
View article: Constraints on cosmologically coupled black holes from gravitational wave observations and minimal formation mass
Constraints on cosmologically coupled black holes from gravitational wave observations and minimal formation mass Open
We test the possibility that the black holes (BHs) detected by LIGO-Virgo-KAGRA (LVK) may be cosmologically coupled and grow in mass proportionally to the cosmological scale factor to some power k, which may also act as the dark energy sou…
View article: Constraints on cosmologically coupled black holes from gravitational wave observations and minimal formation mass
Constraints on cosmologically coupled black holes from gravitational wave observations and minimal formation mass Open
We test the possibility that the black holes (BHs) detected by LIGO-Virgo-KAGRA (LVK) may be cosmologically coupled and grow in mass proportionally to the cosmological scale factor to some power k, which may also act as the dark energy sou…
View article: Synergistic Detection of Multimodal Fake News Leveraging TextGCN and Vision Transformer
Synergistic Detection of Multimodal Fake News Leveraging TextGCN and Vision Transformer Open
In today's digital age, the rapid spread of fake news is a pressing concern. Fake news, whether intentional or inadvertent, manipulates public sentiment and threatens the integrity of online information. To address this, effective detectio…
View article: Probing Cosmology with Baryon Acoustic Oscillations Using Gravitational Waves
Probing Cosmology with Baryon Acoustic Oscillations Using Gravitational Waves Open
The third-generation (3G) gravitational wave (GW) detectors such as the Einstein Telescope or Cosmic Explorer are expected to play an important role in cosmology. With the help of 3G detectors, we will be able to probe large-scale structur…
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: Broadband Quantum Enhancement of the LIGO Detectors with Frequency-Dependent Squeezing
Broadband Quantum Enhancement of the LIGO Detectors with Frequency-Dependent Squeezing Open
Quantum noise imposes a fundamental limitation on the sensitivity of interferometric gravitational-wave detectors like LIGO, manifesting as shot noise and quantum radiation pressure noise. Here, we present the first realization of frequenc…
View article: Blind spots and biases: the dangers of ignoring eccentricity in gravitational-wave signals from binary black holes
Blind spots and biases: the dangers of ignoring eccentricity in gravitational-wave signals from binary black holes Open
Most gravitational wave (GW) events observed by the LIGO and Virgo detectors are consistent with mergers of binary black holes (BBHs) on quasi-circular orbits. However, some events are also consistent with non-zero orbital eccentricity, wh…
View article: Overview of KAGRA : Data transfer and management
Overview of KAGRA : Data transfer and management Open
KAGRA is a newly built gravitational wave observatory, a laser interferometer with a 3 km arm length, located in Kamioka, Gifu prefecture, Japan. In this article, we describe the KAGRA data management system, i.e., recording of data, trans…
View article: Quantum scattering cross sections of O($^3P$) + N$_2$ collisions for planetary aeronomy
Quantum scattering cross sections of O($^3P$) + N$_2$ collisions for planetary aeronomy Open
"Hot atoms", which are atoms in their excited states, transfer their energy to the surrounding atmosphere through collisions. This process of energy transfer is known as thermalization, and it plays a crucial role in various astrophysical …
View article: A Literature Survey on Impact of Nano Silica Mixing Methods on Recycled Aggregate Concrete Properties
A Literature Survey on Impact of Nano Silica Mixing Methods on Recycled Aggregate Concrete Properties Open
This literature survey examines the impact of different nano silica mixing methods on the properties of recycled aggregate concrete. With the increasing demand for sustainable construction materials, the utilization of recycled aggregates …
View article: 4-OGC: Catalog of Gravitational Waves from Compact Binary Mergers
4-OGC: Catalog of Gravitational Waves from Compact Binary Mergers Open
We present the fourth Open Gravitational-wave Catalog (4-OGC) of binary neutron star (BNS), binary black hole (BBH), and neutron star–black hole (NSBH) mergers. The catalog includes observations from 2015 to 2020 covering the first through…
View article: A Novel Architecture for room temperature microwave optomechanical experiments
A Novel Architecture for room temperature microwave optomechanical experiments Open
The dataset contains cavity optomechanical measurements of the Si3N4 membrane at room temperature. These datasets correspond to different techniques to extract single photon coupling rate g0. The files with the name starting with fig_2 are…
View article: Novel Ringdown Amplitude-Phase Consistency Test
Novel Ringdown Amplitude-Phase Consistency Test Open
: The ringdown signal emitted during a binary black hole coalescence can be modeled as a linear superposition of the characteristic damped modes of the remnant black hole that get excited during the merger phase. While checking the consist…
View article: Nano-beam clamping revisited
Nano-beam clamping revisited Open
Within recent years, the field of nano-mechanics has diversified in a variety of applications, ranging from quantum information processing to biological molecules recognition. Among the diversity of devices produced these days, the simples…
View article: A novel ringdown amplitude-phase consistency test
A novel ringdown amplitude-phase consistency test Open
The ringdown signal emitted during a binary black hole coalescence can be modeled as a linear superposition of the characteristic damped modes of the remnant black hole that get excited during the merger phase. While checking the consisten…
View article: Constraining mass of the graviton with GW170817
Constraining mass of the graviton with GW170817 Open
We consider the massive graviton phenomenological model based on the graviton's dispersion terms included into phase of gravitational wave's waveform. Such model was already considered in many works but it was based on a single leading-ord…
View article: Identifying the leaders and main conspirators of the attacks in terrorist networks
Identifying the leaders and main conspirators of the attacks in terrorist networks Open
This study proposes a novel method for identifying the primary conspirators involved in terrorist activities. To map the information related to terrorist activities, we gathered information from different sources of real cases involving te…
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…
View article: Probing Cosmology with Baryon Acoustic Oscillations using Gravitational Waves
Probing Cosmology with Baryon Acoustic Oscillations using Gravitational Waves Open
The third-generation (3G) gravitational wave (GW) detectors such as the Einstein telescope (ET) or Cosmic Explorer (CE) are expected to play an important role in cosmology. With the help of 3G detectors, we will be able to probe large-scal…
View article: Parameter Estimation with Nonstationary Noise in Gravitational-wave Data
Parameter Estimation with Nonstationary Noise in Gravitational-wave Data Open
The sensitivity of gravitational-wave (GW) detectors is characterized by their noise curves, which determine the detector's reach and ability to measure the parameters of astrophysical sources accurately. The detector noise is typically mo…
View article: 4-OGC: Catalog of gravitational waves from compact-binary mergers
4-OGC: Catalog of gravitational waves from compact-binary mergers Open
We present the fourth Open Gravitational-wave Catalog (4-OGC) of binary neutron star (BNS), binary black hole (BBH) and neutron star-black hole (NSBH) mergers. The catalog includes observations from 2015-2020 covering the first through thi…
View article: 3-OGC: Catalog of Gravitational Waves from Compact-binary Mergers
3-OGC: Catalog of Gravitational Waves from Compact-binary Mergers Open
We present the third open gravitational-wave catalog (3-OGC) of compact-binary coalescences, based on the analysis of the public LIGO and Virgo data from 2015 through 2019 (O1, O2, O3a). Our updated catalog includes a population of 57 obse…
View article: Radiative Cooling of the Thermally Isolated System in KAGRA Gravitational Wave Telescope
Radiative Cooling of the Thermally Isolated System in KAGRA Gravitational Wave Telescope Open
Radiative cooling of the thermally isolated system is investigated in KAGRA gravitational wave telescope. KAGRA is a laser interferometer-based detector and main mirrors constituting optical cavities are cool down to 20K to reduce noises c…
View article: Vibration isolation systems for the beam splitter and signal recycling mirrors of the KAGRA gravitational wave detector
Vibration isolation systems for the beam splitter and signal recycling mirrors of the KAGRA gravitational wave detector Open
KAGRA is an underground interferometric gravitational wave detector which is currently being commissioned. This detector relies on high-performance vibration-isolation systems to suspend its key optical components. These suspensions come i…
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: Application of independent component analysis to the iKAGRA data
Application of independent component analysis to the iKAGRA data Open
We apply independent component analysis (ICA) to real data from a gravitational wave detector for the first time. Specifically, we use the iKAGRA data taken in April 2016, and calculate the correlations between the gravitational wave strai…