Confronting sound speed resonance with pulsar timing arrays
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866909555476135936 |
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| author | Jin, Jia-Heng Chen, Zu-Cheng Yi, Zhu You, Zhi-Qiang Liu, Lang Wu, You |
| author_facet | Jin, Jia-Heng Chen, Zu-Cheng Yi, Zhu You, Zhi-Qiang Liu, Lang Wu, You |
| contents | 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 $|τ_0| \in [2.05, 106] \times 10^7$s |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2307_08687 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Confronting sound speed resonance with pulsar timing arrays Jin, Jia-Heng Chen, Zu-Cheng Yi, Zhu You, Zhi-Qiang Liu, Lang Wu, You Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology 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 $|τ_0| \in [2.05, 106] \times 10^7$s |
| title | Confronting sound speed resonance with pulsar timing arrays |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2307.08687 |