Radiation Driven Inflation

TL;DR

This paper introduces a radiation-driven inflation model within unified brane cosmology, where a natural phase transition explains inflation exit without re-heating or fine tuning, unifying inflationary and radiation-dominated phases.

Contribution

It presents a scalar field free inflationary model based on brane cosmology, with a natural second-order phase transition as the exit mechanism.

Findings

Achieves the required number of e-folds without fine tuning.

Provides a natural exit via a second-order phase transition.

Unifies inflation and radiation-dominated phases through a single energy density.

Abstract

A novel scalar field free approach to cosmic inflation is presented. The inflationary Universe and the radiation dominated Universe are shown, within the framework of unified brane cosmology, to be two different phases governed by one and the same energy density. The phase transition of second order (the Hubble constant exhibits a finite jump) appears naturally and serves as the exit mechanism. No re-heating is needed. The required number of e-folds is achieved without fine tuning.