Non-Planck equilibrium radiation in plasma model of early Universe

TL;DR

This paper explores how primordial radiation in the early Universe's dense plasma could deviate from the traditional Planck distribution due to adiabatic expansion effects, suggesting a generalized equilibrium spectrum.

Contribution

It introduces a generalized equilibrium radiation distribution in a dense plasma, extending the classical black body radiation model for early Universe conditions.

Findings

Equilibrium distribution differs from Planck in certain spectral regions.

Conditions for adiabatic expansion in early Universe plasma are established.

Generalized radiation distribution applicable to dense plasma environments.

Abstract

Consideration of the adiabatic character of radiation expansion in early Universe leads to the conclusion that equilibrium distribution of the primordial radiation in the presence of charged particles could be different from the Planck distribution in some regions of the spectrum. The equilibrium distribution of electromagnetic radiation (the black body radiation) is generalized for the system containing an extremely dense fully ionized plasma. The conditions of the adiabatic expansion of radiation for the model of the early Universe are found.