Gravitational-wave background in bouncing models from semi-classical, quantum and string gravity
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| Format: | Preprint |
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2024
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| author | Ben-Dayan, Ido Calcagni, Gianluca Gasperini, Maurizio Mazumdar, Anupam Pavone, Eliseo Thattarampilly, Udaykrishna Verma, Amresh |
| author_facet | Ben-Dayan, Ido Calcagni, Gianluca Gasperini, Maurizio Mazumdar, Anupam Pavone, Eliseo Thattarampilly, Udaykrishna Verma, Amresh |
| contents | We study the primordial spectra and the gravitational-wave background (GWB) of three models of semi-classical, quantum or string gravity where the big bang is replaced by a bounce and the primordial tensor spectrum is blue: ekpyrotic universe with fast-rolling Galileons, string-gas cosmology with Atick-Witten conjecture and pre-big-bang cosmology. We find that the ekpyrotic scenario with Galileons does not produce a GWB amplitude detectable by present or third-generation interferometers, while the Atick-Witten-based string-gas model is ruled out in its present form for violating the big-bang-nucleosynthesis bound, contrary to the original string-gas scenario. In contrast, the GWB of the pre-big-bang scenario falls within the sensitivity window of both LISA and Einstein Telescope, where it takes the form of a single or a broken power law depending on the choice of parameters. The latter will be tightly constrained by both detectors. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2406_13521 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Gravitational-wave background in bouncing models from semi-classical, quantum and string gravity Ben-Dayan, Ido Calcagni, Gianluca Gasperini, Maurizio Mazumdar, Anupam Pavone, Eliseo Thattarampilly, Udaykrishna Verma, Amresh General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics High Energy Physics - Theory We study the primordial spectra and the gravitational-wave background (GWB) of three models of semi-classical, quantum or string gravity where the big bang is replaced by a bounce and the primordial tensor spectrum is blue: ekpyrotic universe with fast-rolling Galileons, string-gas cosmology with Atick-Witten conjecture and pre-big-bang cosmology. We find that the ekpyrotic scenario with Galileons does not produce a GWB amplitude detectable by present or third-generation interferometers, while the Atick-Witten-based string-gas model is ruled out in its present form for violating the big-bang-nucleosynthesis bound, contrary to the original string-gas scenario. In contrast, the GWB of the pre-big-bang scenario falls within the sensitivity window of both LISA and Einstein Telescope, where it takes the form of a single or a broken power law depending on the choice of parameters. The latter will be tightly constrained by both detectors. |
| title | Gravitational-wave background in bouncing models from semi-classical, quantum and string gravity |
| topic | General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics High Energy Physics - Theory |
| url | https://arxiv.org/abs/2406.13521 |