arXiv subjects

Souradeep Pal

Publications and source records attributed to Souradeep Pal.

5 recordsLinked to original sources

arXiv2026

Utilizing anticoincidence veto in a search for gravitational-wave transients

We devise a technique to suppress the effect of noise transients occurring at gravitational-wave detectors based on temporal anticoincidence. Searches for gravitational-wave signals in the detector data are prone to spurious disturbances of terrestrial origin. The technique presented here benefits from the fact that the noise effects are generally non-coincident in time at geographically separated detectors. Therefore, abnormally loud detector triggers that are not time-coincident can be vetoed. We implement the veto technique in a matched-filter search for transient signals from binary black holes and observe search backgrounds to be generally close to the Gaussian limit. An improvement in the sensitivity of the search is demonstrated using simulated signals. The technique is expected to especially improve the detection efficiency of the search for short duration gravitational waves.

gr-qc↗

arXiv2025

Observable spins in gravitational waves from compact binary mergers

We investigate the measurability of effective inspiral spin in the detectable compact binary mergers using gravitational-wave observations. Measurements from the latest gravitational-wave transient catalog do not rule out the existence of binary systems with non-zero effective spins. However, we observe an apparent correlation between the inferred effective inspiral spin and the loudness of the gravitational-wave events-loud events typically have close-to-zero effective spins whereas fainter events tend to be inferred with relatively arbitrary effective spins. Through simulations, we demonstrate that non-negligible effective spins can be systematically inferred from non-spinning systems at small signal strengths. These two observations support the possibility that the effective spin magnitudes in the observable compact binaries are generally small. Future detections can have potential impact on the understanding of their population and other astrophysical inferences.

gr-qc↗

arXiv2025

Sky localization of gravitational waves from eccentric binaries

We demonstrate that the orbital eccentricity in compact binary mergers can be used to improve their sky localization using gravitational wave observations. Existing algorithms that conduct the localizations are not optimized for eccentric sources. We use a semi-Bayesian technique to carry out localizations of simulated sources recovered using a matched-filter search. Through these simulations, we find that if a non-negligible eccentricity is obtained during the detection, an eccentricity-optimized algorithm can significantly improve the localization areas compared to the existing methods. We also lay out the foundation for an eccentric early-warning system using the matched-filter search. The potential impact on the early-warning localization is investigated. We indicate a few possible cases of improvements while accounting for eccentricity toward any detectable eccentric neutron star binaries in the forthcoming observing scenarios of ground-based detectors. Improved localizations can be useful in effectually utilizing the capabilities of the follow-up facilities.

gr-qc↗

arXiv2024

Tidal reconstruction of neutron star mergers from their late inspiral

We investigate the measurement correlation between the effective spin and the effective tidal deformability in gravitational wave signals from binary neutron star mergers. To efficiently measure the effective tidal deformability parameter, we exploit the fact that the tidal effects in a binary system are prominent when the components are closer during the late-inspiral. Thus, we indicate to a computationally efficient strategy of extracting the tidal information compressed within seconds before the merger. We report our observations for \texttt{GW170817} and explore the suitability of our approach in the upcoming observation scenarios of the current and the future ground-based observatories. Fast and accurate measurements of the tidal deformability parameters can be used to inform astronomers in prioritizing the electromagnetic follow-up efforts for such sources.

gr-qc↗

arXiv2023

Swarm-intelligent search for gravitational waves from eccentric binary mergers

We implement an eccentric search for compact binary mergers based on particle swarm optimization. Orbital eccentricity is an invaluable input for understanding the formation scenarios of the binary mergers and can play a pivotal role in finding their electromagnetic counterparts. Current modelled searches rely on pre-computed template banks that are computationally expensive and resistant towards expanding the search parameter space dimensionality. On the other hand, particle swarm optimization offers a straightforward algorithm that dynamically selects template points while exploring an arbitrary dimensional parameter space. Through extensive evaluation using simulated signals from spin-aligned eccentric binary mergers, we discovered that the search exhibits a remarkable autonomy in capturing the effects of both eccentricity and spin. We describe our search pipeline and revisit some of the merger candidates from the gravitational wave transient catalogs.

gr-qc↗