Constraints on the Pre-Big Bang scenario from a cosmological interpretation of the NANOGrav data
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866917927026950144 |
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| author | Conzinu, P. Fanizza, G. Gasperini, M. Pavone, E. Tedesco, L. Veneziano, G. |
| author_facet | Conzinu, P. Fanizza, G. Gasperini, M. Pavone, E. Tedesco, L. Veneziano, G. |
| contents | We discuss a recently proposed fit of the 15-year data set obtained from the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) in terms of a relic stochastic background of primordial gravitons, produced in the context of the string cosmology pre-big bang scenario. We show that such interpretation cannot be reconciled with a phenomenologically viable minimal version of such scenario, while it can be allowed if one considers an equally viable but generalised, non-minimal version of pre-big bang evolution. Maintaining the $S$-duality symmetry throughout the high-curvature string phase is possible although somewhat disfavoured. The implications of this non-minimal scenario for the power spectrum of curvature perturbations are also briefly discussed. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2412_01734 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Constraints on the Pre-Big Bang scenario from a cosmological interpretation of the NANOGrav data Conzinu, P. Fanizza, G. Gasperini, M. Pavone, E. Tedesco, L. Veneziano, G. High Energy Physics - Theory Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology We discuss a recently proposed fit of the 15-year data set obtained from the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) in terms of a relic stochastic background of primordial gravitons, produced in the context of the string cosmology pre-big bang scenario. We show that such interpretation cannot be reconciled with a phenomenologically viable minimal version of such scenario, while it can be allowed if one considers an equally viable but generalised, non-minimal version of pre-big bang evolution. Maintaining the $S$-duality symmetry throughout the high-curvature string phase is possible although somewhat disfavoured. The implications of this non-minimal scenario for the power spectrum of curvature perturbations are also briefly discussed. |
| title | Constraints on the Pre-Big Bang scenario from a cosmological interpretation of the NANOGrav data |
| topic | High Energy Physics - Theory Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2412.01734 |