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