Nonlinear Spinor Fields in LRS Bianchi type-I spacetime: Theory and observation

TL;DR

This paper investigates the influence of nonlinear spinor fields on the evolution of the universe within a specific cosmological model, using observational data to constrain parameters and estimate the universe's age.

Contribution

It introduces a polynomial nonlinearity in spinor fields within LRS Bianchi type-I models and matches theoretical predictions with observational data.

Findings

Universe age estimated at 15 billion years with soft beginning

Universe age estimated at 13.7 billion years with hard beginning

Nonlinear spinor fields significantly affect cosmological evolution

Abstract

Within the scope of a LRS Bianchi type-I cosmological model we study the role of the nonlinear spinor field in the evolution of the Universe. In doing so we consider a polynomial type of nonlinearity that describes different stages of the evolution. Finally we also use the observational data to fix the problem parameters that match best with the real picture of the evolution. The assessment of the age of the Universe in case of the soft beginning of expansion (initial speed of expansion in a point of singularity is equal to zero) the age was found 15 billion years, whereas in case of the hard beginning (nontrivial initial speed) it was found that the Universe is 13.7 billion years old.