Phantom Inflation with A Steplike Potential

TL;DR

This paper investigates how a steplike potential affects the primordial power spectrum in phantom inflation, revealing that oscillation patterns are similar to normal inflation but differ in spectral tilt.

Contribution

It demonstrates that phantom inflation with a steplike potential produces oscillation patterns similar to normal inflation, with differences primarily in the spectral tilt.

Findings

Oscillation patterns in phantom and normal inflation are nearly identical.

The main difference lies in the tilt of the power spectrum.

Potential observational signatures could distinguish phantom from normal inflation.

Abstract

The phantom inflation predicts a slightly blue spectrum of tensor perturbation, which might be tested in coming observations. In normal inflation models, the introduction of step in its potential generally results in an oscillation in the primordial power spectrum of curvature perturbation. We will check whether there is a similar case in the phantom inflation with steplike potential. We find that for same potentials, the oscillation of the spectrum of phantom inflation is nearly same with that of normal inflation, the difference between them is the tilt of power spectrum.