Testing a DBI model for the unification of dark matter and dark energy with Gamma-Ray Bursts

TL;DR

This paper tests a nonlinear scalar field DBI model aiming to unify dark matter and dark energy by analyzing high-redshift Gamma-Ray Burst data alongside other cosmological observations, providing constraints on key parameters.

Contribution

It introduces a novel approach using GRBs to test a DBI scalar field model for dark sector unification, avoiding circularity issues present in previous methods.

Findings

Consistent with current cosmological data

Provides constraints on the equation of state parameter w

Determines the transition redshift z_t

Abstract

We study the range of consistency of a model based on a nonlinear scalar field Dirac-Born-Infeld action for the unification of dark matter and dark energy using Gamma-Ray Bursts at high-redshifts. We use the sample of 59 high-redshift GRBs reported by Wei (2010), calibrated at low redshifts with the Union 2 sample of SNe Ia, thus avoiding the circularity problem. In this analysis, we also include the CMB7-year data and the baryonic acoustic peak BAO. Besides, it is calculated the parameter of the equation of state $w$, the deceleration parameter $q_0$ and the redshift of the transition to the decelerate-accelerated phase $z_t$.