Cosmological super inflation using Hamilton's approach

TL;DR

This paper models super inflation in cosmology using Hamilton's approach with exact solutions to Einstein-Klein-Gordon equations, showing agreement with inflationary conditions and analyzing quantum wave functions.

Contribution

It provides exact solutions for inflation without slow-roll assumptions using Hamilton's formalism in a supersymmetric quantum mechanics framework.

Findings

Solutions match inflationary e-folding conditions

Positive acceleration during inflation period

Quantum wave function peaks at large scale factors

Abstract

The Friedmann-Robertson-Walker (FRW) cosmology is analyzed with a particular potential $\rm V(\phi)=V_0 e^{-\sqrt{3} \phi}$ in the quintessence field scenario, which emerges in the supersymmetric quantum mechanics (SUSY) formalism. Using Hamilton's approach for a scalar field $\phi$ with standard kinetic energy, and the Hamilton equations, we find exact solutions to the complete set of the Einstein-Klein-Gordon equations without the need of the slow-roll conditions in order to model the inflation phenomenon. We find that the solutions are in good agreement with the inflationary conditions such as the e-folding function ${\cal N}$ which corresponds to the $\Omega$ function in the Misner parametrization for the scale factor $\rm A(t)=e^{\Omega(t)}$ when evaluated in $\rm \Delta t$, which is the time interval for the inflation period. The acceleration of the scale factor was computed and it was found to be positive for the inflation period with a range of values for the parameters of the model. Quantum solution from the Wheeler-DeWitt equation is presented, where the wave function in relation to the evolution of the scale factor, shows that for this period of time at larger values of $\rm A$ and for any value of scalar-field $\rm \varphi$, the wave function is peaked.