Some Aspects of the Tachyon Inflation with Superpotential in Confrontation with Planck2018 Data

TL;DR

This paper investigates tachyon inflation with a superpotential, analyzing primordial perturbations, non-gaussianity, and reheating, and compares the model's predictions with Planck2018 and LIGO/Virgo data to assess observational viability.

Contribution

It introduces a novel tachyon inflation model with superpotential and evaluates its compatibility with recent observational data, including non-gaussianity and reheating phases.

Findings

Model can be consistent with Planck2018 data within certain parameter ranges.

Predicted equilateral non-gaussianity amplitude is within observational bounds.

Reheating phase can be successfully incorporated in the model.

Abstract

We study the tachyon inflation in the presence of the superpotential as an inflationary potential. We study the primordial perturbations and their non-gaussian feature in the equilateral configuration. We use the Planck2018 TT, TE, EE+lowE+lensing+BK14+BAO joint data at $68\%$ CL and $95\%$ CL, to perform numerical analysis on the scalar perturbations and seek for the observational viability of the tachyon inflation with superpotential. We also check the observational viability of the model by studying the tensor part of the perturbations and comparing the results with Planck2018 TT, TE, EE+lowE+lensing+BK14+BAO+ LIGO$\&$Virgo2016 joint data at $68\%$ CL and $95\%$ CL. By studying the phase space of the model's parameters, we predict the amplitude of the equilateral non-gaussianity in this model. The reheating phase after inflation is another issue that is explored in this paper. We show that, in some ranges of the model's parameters, it is possible to have an observationally viable tachyon model with superpotential.