Dynamical homogenization in effective loop quantum cosmology
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arXiv
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866917950712184832 |
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| author | Wilson-Ewing, Edward |
| author_facet | Wilson-Ewing, Edward |
| contents | The effective dynamics of loop quantum gravity for marginally bound Lemaître-Tolman-Bondi spacetimes predict that the big-bang singularity is resolved and replaced by a cosmic bounce. Numerics show that these effective dynamics also homogenize small regions soon after the bounce when inhomogeneities before the bounce are sufficiently large. These homogeneous regions typically have a width of a few Planck lengths where relative perturbations in the energy density remain less than 15%. If the bounce is followed by an inflationary period, the homogeneous region can reach cosmic scales and the amplitude of relative perturbations can be suppressed to a value compatible with observations. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2409_18889 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Dynamical homogenization in effective loop quantum cosmology Wilson-Ewing, Edward General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics The effective dynamics of loop quantum gravity for marginally bound Lemaître-Tolman-Bondi spacetimes predict that the big-bang singularity is resolved and replaced by a cosmic bounce. Numerics show that these effective dynamics also homogenize small regions soon after the bounce when inhomogeneities before the bounce are sufficiently large. These homogeneous regions typically have a width of a few Planck lengths where relative perturbations in the energy density remain less than 15%. If the bounce is followed by an inflationary period, the homogeneous region can reach cosmic scales and the amplitude of relative perturbations can be suppressed to a value compatible with observations. |
| title | Dynamical homogenization in effective loop quantum cosmology |
| topic | General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2409.18889 |