2025/07/07 by Ghosh, Tathagata, Bose, Sukanta, Dhurandhar, Sanjeev +1
#FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #Instrumentation and Methods for Astrophysics (astro-ph.IM)
paper · doi:10.48550/arxiv.2507.04628
The sensitivity of current gravitational wave (GW) detectors to transient GW signals is severely affected by a variety of non-Gaussian and non-stationary noise transients, such as the blip and tomte "glitches". These glitches share some time-frequency resemblance with GW signals from massive binary black holes. In earlier works [Joshi et al., Phys. Rev. D 103, 044035 (2021); Choudhary et al., Phys. Rev. D 110, 044051 (2024)], the authors presented a method for constructing a χ2-distributed optimized statistic, based on the unified formalism of χ2 discriminators [Dhurandhar et al., Phys. Rev. D 96, 103018 (2017)], to distinguish the blip and tomte glitches from the compact binary coalescence (CBC) signals. Unlike past works, the new χ2 discriminator is constructed from the most significant singular vectors obtained from the singular-value decomposition (SVD) of glitches in real detector data. We find that the chi-square developed in this work performs as efficiently as in Choudhary et al. [Phys. Rev. D 110, 044051 (2024)], which used sine-Gaussian basis vectors. This result supports past empirical findings that the blips and tomtes are well-modeled by sine-Gaussians. It also introduces a method for constructing signal- and glitch-based χ2 discriminators by directly using real data containing the glitches and, thus, holds promise for extensions to glitches that are captured less well by sine-Gaussians or other analytical functions.