Following the primordial perturbations through a bounce with AdS/CFT correspondence
Abstract A bounce universe model, known as the coupled-scalar-tachyon bounce (CSTB) universe, has been shown to solve the Horizon, Flatness and Homogeneity problems as well as the Big Bang singularity problem. Furthermore a scale invariant spectrum of primordial density perturbations generated from...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2018-09-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | http://link.springer.com/article/10.1140/epjc/s10052-018-6228-8 |
| _version_ | 1818186943549145088 |
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| author | Lei Ming Taifan Zheng Yeuk-Kwan E. Cheung |
| author_facet | Lei Ming Taifan Zheng Yeuk-Kwan E. Cheung |
| author_sort | Lei Ming |
| collection | DOAJ |
| description | Abstract A bounce universe model, known as the coupled-scalar-tachyon bounce (CSTB) universe, has been shown to solve the Horizon, Flatness and Homogeneity problems as well as the Big Bang singularity problem. Furthermore a scale invariant spectrum of primordial density perturbations generated from the phase of pre-bounce contraction is shown to be stable against time evolution. In this work we study the detailed dynamics of the bounce and its imprints on the scale invariance of the spectrum. The dynamics of the gravitational interactions near the bounce point may be strongly coupled as the spatial curvature becomes big. There is no a prior reason to expect the spectral index of the primordial perturbations of matter density can be preserved. By encoding the bounce dynamics holographically onto the dynamics of dual Yang–Mills system while the latter is weakly coupled, via the AdS/CFT correspondence, we can safely evolve the spectrum of the cosmic perturbations with full control. In this way we can compare the post-bounce spectrum with the pre-bounce one: in the CSTB model we explicitly show that the spectrum of primordial density perturbations generated in the contraction phase preserves its stability as well as scale invariance throughout the bounce process. |
| first_indexed | 2024-12-11T23:03:10Z |
| format | Article |
| id | doaj.art-98b26627a9a943feb8aca34d0fd4535c |
| institution | Directory Open Access Journal |
| issn | 1434-6044 1434-6052 |
| language | English |
| last_indexed | 2024-12-11T23:03:10Z |
| publishDate | 2018-09-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-98b26627a9a943feb8aca34d0fd4535c2022-12-22T00:47:01ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60441434-60522018-09-0178911410.1140/epjc/s10052-018-6228-8Following the primordial perturbations through a bounce with AdS/CFT correspondenceLei Ming0Taifan Zheng1Yeuk-Kwan E. Cheung2Department of Physics, Nanjing UniversityDepartment of Physics, Nanjing UniversityDepartment of Physics, Nanjing UniversityAbstract A bounce universe model, known as the coupled-scalar-tachyon bounce (CSTB) universe, has been shown to solve the Horizon, Flatness and Homogeneity problems as well as the Big Bang singularity problem. Furthermore a scale invariant spectrum of primordial density perturbations generated from the phase of pre-bounce contraction is shown to be stable against time evolution. In this work we study the detailed dynamics of the bounce and its imprints on the scale invariance of the spectrum. The dynamics of the gravitational interactions near the bounce point may be strongly coupled as the spatial curvature becomes big. There is no a prior reason to expect the spectral index of the primordial perturbations of matter density can be preserved. By encoding the bounce dynamics holographically onto the dynamics of dual Yang–Mills system while the latter is weakly coupled, via the AdS/CFT correspondence, we can safely evolve the spectrum of the cosmic perturbations with full control. In this way we can compare the post-bounce spectrum with the pre-bounce one: in the CSTB model we explicitly show that the spectrum of primordial density perturbations generated in the contraction phase preserves its stability as well as scale invariance throughout the bounce process.http://link.springer.com/article/10.1140/epjc/s10052-018-6228-8 |
| spellingShingle | Lei Ming Taifan Zheng Yeuk-Kwan E. Cheung Following the primordial perturbations through a bounce with AdS/CFT correspondence European Physical Journal C: Particles and Fields |
| title | Following the primordial perturbations through a bounce with AdS/CFT correspondence |
| title_full | Following the primordial perturbations through a bounce with AdS/CFT correspondence |
| title_fullStr | Following the primordial perturbations through a bounce with AdS/CFT correspondence |
| title_full_unstemmed | Following the primordial perturbations through a bounce with AdS/CFT correspondence |
| title_short | Following the primordial perturbations through a bounce with AdS/CFT correspondence |
| title_sort | following the primordial perturbations through a bounce with ads cft correspondence |
| url | http://link.springer.com/article/10.1140/epjc/s10052-018-6228-8 |
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