Non-singular pre-big bang scenarios from all-order $α'$ corrections
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arXiv
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866917931304091648 |
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| author | Gasperini, M. Veneziano, G. |
| author_facet | Gasperini, M. Veneziano, G. |
| contents | We reformulate in Hamiltonian language the recent proposal by Hohm and Zwiebach of an action yielding the most general $O(d,d)$-symmetric string cosmology equations, at tree-level in the string-loop expansion, but to all orders in the $α'$ expansion. This allows us to give a simple characterization of a large class of non-singular, non-perturbative, pre-big bang scenarios smoothly interpolating between a low-energy initial accelerated (string frame) expansion and a phase of final (string and Einstein frame) decelerated expansion. Interestingly, these solutions must necessarily include, just around the bounce, a very short phase of (string-frame) contraction. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2305_00222 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Non-singular pre-big bang scenarios from all-order $α'$ corrections Gasperini, M. Veneziano, G. High Energy Physics - Theory General Relativity and Quantum Cosmology We reformulate in Hamiltonian language the recent proposal by Hohm and Zwiebach of an action yielding the most general $O(d,d)$-symmetric string cosmology equations, at tree-level in the string-loop expansion, but to all orders in the $α'$ expansion. This allows us to give a simple characterization of a large class of non-singular, non-perturbative, pre-big bang scenarios smoothly interpolating between a low-energy initial accelerated (string frame) expansion and a phase of final (string and Einstein frame) decelerated expansion. Interestingly, these solutions must necessarily include, just around the bounce, a very short phase of (string-frame) contraction. |
| title | Non-singular pre-big bang scenarios from all-order $α'$ corrections |
| topic | High Energy Physics - Theory General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2305.00222 |