Abstract
Abstract
The recent stochastic signal observed jointly by NANOGrav, parkes pulsar timing array, European pulsar timing array, and Chinese pulsar timing array can be accounted for by scalar-induced gravitational waves (SIGWs). The source of the SIGWs is from the primordial curvature perturbations, and the main contribution to the SIGWs is from the peak of the primordial curvature power spectrum. To effectively model this peak, we apply the Taylor expansion to parameterize it. With the Taylor expansion parameterization, we apply Bayesian methods to constrain the primordial curvature power spectrum based on the NANOGrav 15 year data set. The constraint on the primordial curvature power spectrum possesses a degree of generality, as the Taylor expansion can effectively approximate a wide range of function profiles.
Funder
National Natural Science Foundation of China
Subject
Physics and Astronomy (miscellaneous)
Reference170 articles.
1. GWTC-1: a gravitational-wave transient catalog of compact binary mergers observed by ligo and virgo during the first and second observing runs;(LIGO Scientific, Virgo);Phys. Rev.,2019
2. GWTC-2: compact binary coalescences observed by ligo and virgo during the first half of the third observing run;(LIGO Scientific, Virgo);Phys. Rev.,2021
3. GWTC-3: Compact binary coalescences observed by LIGO and Virgo during the second part of the third observing run;(KAGRA, VIRGO, LIGO Scientific);Phys. Rev.,2023
4. Binary black hole population properties inferred from the first and second observing runs of advanced LIGO and advanced virgo;(LIGO Scientific, Virgo);Astrophys. J. Lett.,2019
5. Stochastic gravitational-wave background from binary black holes and binary neutron stars and implications for LISA;Chen;Astrophys. J.,2019