Bubble wall velocities with an extended fluid Ansatz

We compute the terminal bubble wall velocity during a cosmological phase transition by modelling non-equilibrium effects in the plasma with the so-called “extended fluid Ansatz ”. A ϕ 6 operator is included in the Standard Model effective potential to mimic effects of new physics. Hydrodynamical hea...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2024-04, Vol.2024 (4), p.27
Main Authors: Dorsch, Gláuber C., Pinto, Daniel A.
Format: Article
Language:English
Subjects:
Astronomical models
Bubbles
Cosmology
Deflagration
Detonation
particle physics — cosmology connection
Phase transitions
Physics
physics of the early universe
Standard model (particle physics)
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Summary:We compute the terminal bubble wall velocity during a cosmological phase transition by modelling non-equilibrium effects in the plasma with the so-called “extended fluid Ansatz ”. A ϕ 6 operator is included in the Standard Model effective potential to mimic effects of new physics. Hydrodynamical heating of the plasma ahead of the bubble is taken into account. We find that the inclusion of higher order terms in the fluid Ansatz is typically relevant, and may even turn detonation solutions into deflagrations. Our results also corroborate recent findings in the literature that, for a Standard Model particle content in the plasma, only deflagration solutions are viable. However, we also show that this outcome may be altered in a theory with a different particle content.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2024/04/027