paper

Confronting sound speed resonance with pulsar timing arrays

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Published 7 September 2023 © 2023 IOP Publishing Ltd and Sissa Medialab
, , Citation Jia-Heng Jin et al JCAP09(2023)016 DOI 10.1088/1475-7516/2023/09/016

1475-7516/2023/09/016

Abstract

The stochastic signal detected by pulsar timing arrays (PTAs) has raised great interest in understanding its physical origin. Assuming the signal is a cosmological gravitational-wave background produced by overly large primordial curvature perturbations, we investigate the sound speed resonance effect with an oscillatory behavior using the combined PTA data from NANOGrav 15-yr data set, PPTA DR3, and EPTA DR2. We find that the stochastic signal can be explained by the induced gravitational waves sourced by the sound speed resonance mechanism, with the oscillation frequency f* ∈ [1.51, 4.90] × 10-7Hz and the start time of oscillation |τ0| ∈ [2.05, 106] × 107s.

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