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Title: | Spinodal instability in an expanding universe |
Author: | Pagès Gutiérrez, Pau |
Director/Tutor: | Casalderrey Solana, Jorge |
Keywords: | Expansió de l'univers Transformacions de fase (Física estadística) Treballs de fi de grau Expanding universe Phase transformations (Statistical physics) Bachelor's theses |
Issue Date: | Jun-2023 |
Abstract: | We study the dynamics of matter undergoing a first order phase transition in an expanding universe. We contemplate the scenario where the universe experiences significant supercooling, leading to local instability known as spinodal instability. We use second-order hydrodynamics to derive the equation that governs the behavior of the unstable modes that arise in this situation, and numerically solve it. The resulting solutions differ significantly from the ones found for a flat universe. Specifically, we observe a damped behaviour and a notable time dependence in the momentum range of the unstable modes, highlighting the richer dynamics at play. Finally, we model this time dependence using an adiabatic approximation and show that it captures the main momentum and expansion rate dependence of unstable modes growth |
Note: | Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2023, Tutor: Jorge Casaderrey Solana |
URI: | http://hdl.handle.net/2445/201781 |
Appears in Collections: | Treballs Finals de Grau (TFG) - Física |
Files in This Item:
File | Description | Size | Format | |
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PAGÈS GUTIÉRREZ PAU_7934156.pdf | 329.71 kB | Adobe PDF | View/Open |
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