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| Main Authors: | , , |
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| Format: | Preprint |
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2025
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| Online Access: | https://arxiv.org/abs/2506.06901 |
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| _version_ | 1866911030174547968 |
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| author | Machado, Idaiane L. da Silva, Dêivid R. Pinto-Neto, Nelson |
| author_facet | Machado, Idaiane L. da Silva, Dêivid R. Pinto-Neto, Nelson |
| contents | We calculate the power spectrum of cosmological perturbations originated from quantum vacuum fluctuations in bouncing scenarios proposed in Ref.~\cite{chamseddine2014cosmology} in the framework of mimetic cosmology. We show that all physically relevant models produce scale invariant spectral indices, and amplitudes compatible with observations provided that the bounce occurs at length scales $t_0$ inside the physically reasonable interval $10^5 l_p < t_0 < 10^9 l_p$. We also show that by slightly modifying the scalar field potential proposed in Ref.~\cite{chamseddine2014cosmology}, we can also obtain the observed red-tilted spectral index, with the same amplitude constraints. Hence, mimetic cosmology provides reasonable bouncing cosmological models without the need of any background quantum effect. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_06901 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quantum cosmological perturbations in bouncing models with mimetic dark matter Machado, Idaiane L. da Silva, Dêivid R. Pinto-Neto, Nelson Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Theory 83F05 (Primary), 83C55, 35Q75 (Secondary) We calculate the power spectrum of cosmological perturbations originated from quantum vacuum fluctuations in bouncing scenarios proposed in Ref.~\cite{chamseddine2014cosmology} in the framework of mimetic cosmology. We show that all physically relevant models produce scale invariant spectral indices, and amplitudes compatible with observations provided that the bounce occurs at length scales $t_0$ inside the physically reasonable interval $10^5 l_p < t_0 < 10^9 l_p$. We also show that by slightly modifying the scalar field potential proposed in Ref.~\cite{chamseddine2014cosmology}, we can also obtain the observed red-tilted spectral index, with the same amplitude constraints. Hence, mimetic cosmology provides reasonable bouncing cosmological models without the need of any background quantum effect. |
| title | Quantum cosmological perturbations in bouncing models with mimetic dark matter |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Theory 83F05 (Primary), 83C55, 35Q75 (Secondary) |
| url | https://arxiv.org/abs/2506.06901 |