Equation of State for a van der Waals Universe during Reissner-Nordstrom Expansion

TL;DR

This paper models the early universe's expansion during the radiation epoch as a van der Waals gas, deriving an equation of state based on a Reissner-Nordstrom geometry framework that involves gravitational repulsion.

Contribution

It introduces a novel approach by representing the universe's expansion as a van der Waals gas within a Reissner-Nordstrom geometry, deriving the corresponding equation of state.

Findings

Derived the equation of state for the van der Waals universe during Reissner-Nordstrom expansion.

Provided a classical model linking gravitational repulsion to thermodynamic properties.

Extended previous work on Reissner-Nordstrom expansion to include an equation of state.

Abstract

In a previous work [E.M. Prodanov, R.I. Ivanov, and V.G. Gueorguiev, Reissner-Nordstrom Expansion, Astroparticle Physics 27 (150-154) 2007], we proposed a classical model for the expansion of the Universe during the radiation-dominated epoch based on the gravitational repulsion of the Reissner-Nordstrom geometry - naked singularity description of particles that "grow" with the drop of the temperature. In this work we model the Universe during the Reissner-Nordstrom expansion as a van der Waals gas and determine the equation of state.