TL;DR
This paper examines how quantum chromodynamics (QCD) interactions influence the evolution of the early universe during radiation domination, highlighting their importance for precise cosmological modeling and scalar mode dynamics.
Contribution
It analyzes the deviations from ideal thermal bath assumptions due to QCD effects within the Standard Model and MSSM, emphasizing their impact on cosmological evolution.
Findings
QCD interactions significantly affect the radiation-dominated epoch.
Strong interaction contributions dominate deviations from ideal behavior.
Corrections are crucial for understanding scalar mode evolution.
Abstract
The cosmological evolution in the radiation dominated regimen is usually computed by assuming an ideal relativistic thermal bath. In this note, we discuss the deviation from the non-interaction assumption. In either the standard model (SM) and the minimal supersymmetric standard model (MSSM), the main contribution comes from the strong interaction. An understanding of these effects are important for precision measurements and for the evolution of scalar modes, where the commented corrections constitute the main source of the dynamics.
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