Quintom scalar field : Varying dark energy equation of state obtained from recent SNe Ia, BAO and OHD data

TL;DR

This paper investigates a quintom scalar field model with a Gaussian potential to explain the observed varying dark energy equation of state using recent SNe Ia, BAO, and OHD data, suggesting a transition between quintessence and phantom regimes.

Contribution

It introduces a Gaussian potential for the quintom scalar field to model the varying dark energy equation of state derived from observational data.

Findings

The scalar field model can reproduce the observed $\omega_X(z)$ variation.

A transition between quintessence and phantom phases is supported.

The Gaussian potential aligns well with observational constraints.

Abstract

From the analysis of Supernova Ia data alongwith Observational Hubble Data (OHD) and Baryon Acoustic Oscillation (BAO) data, we attempt to find out the nature of a scalar potential that may be responsible for the Dark Energy of the universe. We demonstrate that in order to explain the varying dark energy equation of state ($\omega_X(z)$) as obtained in a model independent way from the analyses of observational data, we need to invoke a quintom scalar field having a "quintessence" part for $\omega_X(z) > -1$ and a "phantom" part for $\omega_X(z) < -1$. We consider a Gaussian type potential for these scalar fields and compare the dark energy equation of state derived from such potential with the one computed from the data analysis.