On Spin-driven inflation from fields in General Relativity and COBE data

TL;DR

This paper extends Obukhov's spin-driven inflation model within General Relativity to include inflaton fields, deriving a de Sitter solution, new slow-roll conditions, and relating spin density energy to COBE temperature fluctuation data.

Contribution

It introduces a combined model of spin-driven inflation with inflaton fields, deriving new slow-roll conditions and connecting spin density energy to observational data.

Findings

Derived a de Sitter phase solution in the extended model.

Established a relation between spin density energy and COBE temperature fluctuations.

Showed the spin potential reduces to Obukhov's result at late times.

Abstract

Obukhov spin-driven inflation in General Relativity is extended to include inflaton fields.A de Sitter phase solution is obtained and new slow-rolling conditions for the spin potential are obtained.The spin potential reduces to Obukhov result at the present epoch of the Universe where the spin density is low with comparison to the Early Universe spin densities.A relation betwenn the spin density energy and the temperature fluctuation can be obtained which allow us to determine the spin density energy in terms of the COBE data for temperature fluctuations.