Modified Power law Inflation: solution to the graceful exit problem and improvement of dark energy models

TL;DR

This paper introduces a modified power law inflation model with a monomial potential that avoids the graceful exit problem and aligns well with recent observational data, offering improvements for dark energy theories.

Contribution

It presents a novel exact solution for power law inflation with a monomial potential, addressing the graceful exit issue and better matching observational constraints.

Findings

The model fits Planck data well.

It resolves the graceful exit problem.

Large cosmological constant decreases with expansion.

Abstract

We study power law inflation (PLI) with a monomial potential and find a novel exact solution. It is well known that conventional PLI with exponential potential is inconsistent with the Planck data. Unlike the standard PLI, present model does not suffer from graceful exit problem and it agrees fairly well with recent observations. We have calculated the spectral index and the tensor-to-scalar ratio which are in very good agreement with recent observational data and also comparable with other modified inflationary models. A technique has been used which shows that the large cosmological constant reduces with expansion of the Universe in case of the power law inflation. The coupling of the inflaton with gravitation is the main point in this technique. The basic assumption here is that the two metric tensors in the gravitational and the inflaton parts correspond to different conformal frames which is in contradiction with the conventional power law inflation where the inflaton directly coupled with the background metric tensor. This fact has direct application to different dark energy models and assisted quintessence theory.