paper

Constraints on Non-Gaussian primordial curvature perturbation from the LIGO-Virgo-KAGRA third observing run

arXiv:2311.05423 · doi:10.1088/1475-7516/2024/05/082

Abstract

The scalar-induced gravitational waves (SIGW), arising from large amplitude primordial density fluctuations, provide a unique observational test for directly probing the epoch of inflation. In this work, we provide constraints on the SIGW background by taking into account the non-Gaussianity in the primordial density fluctuations, using the third observing run (O3) data of the LIGO-Virgo-KAGRA collaboration. We find that the non-Gaussianity gives a non-negligible effect on the GW energy density spectrum and starts to affect the analysis of the O3 data when the non-Gaussianity parameter is . Furthermore, the constraints exhibit asymptotic behavior given by at large limit, where denotes the amplitude of the curvature perturbations. In the limit of large , we placed a 95% confidence level upper limit at fixed scales of , respectively.

17 pages, 4 figures. Changes match published version

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