Relic gravitational waves from primordial gravitational collapses
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arXiv
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| Format: | Preprint |
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2025
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| author | Zeng, Xiang-Xi Ning, Zhuan Yuwen, Zi-Yan Wang, Shao-Jiang Deng, Heling Cai, Rong-Gen |
| author_facet | Zeng, Xiang-Xi Ning, Zhuan Yuwen, Zi-Yan Wang, Shao-Jiang Deng, Heling Cai, Rong-Gen |
| contents | A large primordial density perturbation of the Hubble scale will gravitationally collapse, generating an outgoing sound shell, whether or not a primordial black hole (PBH) is formed. In this Letter, we report a hybrid numerical analysis of the stochastic gravitational wave background induced by the collision of sound shells in the early Universe. The peak frequency and amplitude in the GW spectrum depend on the Hubble horizon and the abundance of sound shells. Abundant density perturbations would lead to GW backgrounds potentially detectable for future pulsar timing arrays and ground-based/space-borne detectors. For those perturbations that collapse into PBHs, future null detection of the corresponding high-frequency GW background could put new observational constraints on those PBHs that have already evaporated. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_11275 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Relic gravitational waves from primordial gravitational collapses Zeng, Xiang-Xi Ning, Zhuan Yuwen, Zi-Yan Wang, Shao-Jiang Deng, Heling Cai, Rong-Gen General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology A large primordial density perturbation of the Hubble scale will gravitationally collapse, generating an outgoing sound shell, whether or not a primordial black hole (PBH) is formed. In this Letter, we report a hybrid numerical analysis of the stochastic gravitational wave background induced by the collision of sound shells in the early Universe. The peak frequency and amplitude in the GW spectrum depend on the Hubble horizon and the abundance of sound shells. Abundant density perturbations would lead to GW backgrounds potentially detectable for future pulsar timing arrays and ground-based/space-borne detectors. For those perturbations that collapse into PBHs, future null detection of the corresponding high-frequency GW background could put new observational constraints on those PBHs that have already evaporated. |
| title | Relic gravitational waves from primordial gravitational collapses |
| topic | General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2504.11275 |