Confronting sound speed resonance with pulsar timing arrays
Journal of Cosmology and Astroparticle Physics, 2023•iopscience.iop.org
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 …
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 …
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]× 10-7 Hz and the start time of oscillation| τ 0|∈[2.05, 106]× 10 7 s.
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