A dark radiation era prior to the inflationary phase

TL;DR

This paper proposes a cosmological model where a dark radiation-dominated era precedes inflation, based on a Randall-Sundrum II brane-world, with parameters constrained by current observational data.

Contribution

It introduces a novel early-universe scenario with a dark radiation phase before inflation within a brane-world framework.

Findings

Dark radiation era is compatible with current data.

Model constrains dark radiation parameters.

Pre-inflationary phase impacts cosmological evolution.

Abstract

A cosmological model dominated at the beginning by a dark radiation followed by a period of inflation is presented. This model is based on a Randall-Sundrum II type brane-world. Current observational data are used to fix the parameters associated to the dark radiation.