Phase transition between shock formation and stability in cosmological fluids
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arXiv
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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866909191184056320 |
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| author | Fajman, David Maliborski, Maciej Ofner, Maximilian Oliynyk, Todd Wyatt, Zoe |
| author_facet | Fajman, David Maliborski, Maciej Ofner, Maximilian Oliynyk, Todd Wyatt, Zoe |
| contents | We demonstrate a novel phase transition from stable to unstable fluid behaviour for fluid-filled cosmological spacetimes undergoing decelerated expansion. This transition occurs when the fluid speed of sound $c_S$ exceeds a critical value relative to the expansion rate $a(t) = t^α$ of spacetime. We present an explicit relationship between $α$ and $c_S$ , which subdivides the $(α,c_S)$-parameter space into two regions. Using rigorous techniques, we establish stability of quiet fluid solutions in the first stable region. Numerical experiments reveal that the complement of the stable region consists of unstable solutions, implying sharpness of our stability result. We provide a definitive analytical bound and high-precision numerical evidence for the exact location of the critical line separating the stable from the unstable region. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_03431 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Phase transition between shock formation and stability in cosmological fluids Fajman, David Maliborski, Maciej Ofner, Maximilian Oliynyk, Todd Wyatt, Zoe General Relativity and Quantum Cosmology Mathematical Physics We demonstrate a novel phase transition from stable to unstable fluid behaviour for fluid-filled cosmological spacetimes undergoing decelerated expansion. This transition occurs when the fluid speed of sound $c_S$ exceeds a critical value relative to the expansion rate $a(t) = t^α$ of spacetime. We present an explicit relationship between $α$ and $c_S$ , which subdivides the $(α,c_S)$-parameter space into two regions. Using rigorous techniques, we establish stability of quiet fluid solutions in the first stable region. Numerical experiments reveal that the complement of the stable region consists of unstable solutions, implying sharpness of our stability result. We provide a definitive analytical bound and high-precision numerical evidence for the exact location of the critical line separating the stable from the unstable region. |
| title | Phase transition between shock formation and stability in cosmological fluids |
| topic | General Relativity and Quantum Cosmology Mathematical Physics |
| url | https://arxiv.org/abs/2405.03431 |