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Abstract
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 $a(t) = t^\alpha$ of spacetime. We present an explicit relationship between $\alpha$ and $c_S$ , which subdivides the $(\alpha,c_S)$-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.
Original language | English |
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Publisher | arXiv.org |
Publication status | Published - 6 May 2024 |
Funding
Austrian Fields of Science 2012
- 103028 Theory of relativity
- 103019 Mathematical physics
Keywords
- gr-qc
- math-ph
- math.MP
Activities
- 1 Participation in ...
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Structures and Dynamics in Cosmology
Maciej Maliborski (Participant)
13 Jan 2025 → 17 Jan 2025Activity: Academic events › Participation in ...