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Confronting sound speed resonance with pulsar timing arrays

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arxiv 2307.08687 v2 pith:2SD4TU55 submitted 2023-07-17 astro-ph.CO gr-qchep-ph

Jia-Heng Jin , Zu-Cheng Chen , Zhu Yi , Zhi-Qiang You , Lang Liu , You Wu This is my paper · ORCID
classification astro-ph.COgr-qchep-ph
keywords resonancesignalsoundspeedarraysdataoscillationpulsar
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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 $f_* \in [1.51, 4.90] \times 10^{-7}$Hz and the start time of oscillation $|\tau_0| \in [2.05, 106] \times 10^7$s

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Forward citations

Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Scalar-induced gravitational waves from a box-shaped curvature power spectrum

    gr-qc 2026-07 accept novelty 5.5 of 10

    Analytic SIGW spectra for a log-box curvature power spectrum: narrow-box geometric overlap factor turning IR slope k^{3}ln^{2}k into k^{2}ln^{2}k, plus broad-box product of universal edge functions.

  2. Purely quadratic non-Gaussianity from tachyonic instability: Primordial black holes and scalar-induced gravitational waves

    astro-ph.CO 2026-04 unverdicted novelty 5.0 of 10

    Purely quadratic non-Gaussianity from tachyonic instability allows narrow curvature spectra to exponentially suppress primordial black hole overproduction via correlation coefficient ρ approaching -1 while retaining s...

  3. Can tensor-scalar induced GWs dominate PTA observations ?

    astro-ph.CO 2024-12 conditional novelty 5.0 of 10

    A Bayesian fit to NANOGrav 15-year data finds that tensor-scalar induced gravitational waves plus primordial tensor waves can fit the PTA background, with amplitudes constrained by CMB, BAO, and PBH limits.

  4. Tensor induced gravitational waves

    astro-ph.CO 2025-07 conditional novelty 4.0 of 10

    Second-order tensor-induced gravitational waves can shift the inferred parameters of small-scale primordial gravitational wave models fitted to NANOGrav 15-year data, with one model favored by Bayes factors.

  5. Pre-Big-Bang Cosmology Cannot Explain NANOGrav 15-year Signal

    astro-ph.CO 2024-11 conditional novelty 4.0 of 10

    Pre-Big Bang string cosmology cannot explain the NANOGrav 15-year signal; a power-law spectrum is preferred by a Bayes factor of about 468.

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