Ariadna Montiel

Probing bulk viscous matter-dominated models with Gamma-ray bursts

In this paper we extend the range of consistency of a constant bulk viscosity model to redshifts up to

Nonparametric reconstruction of the cosmic expansion with local regression smoothing and simulation extrapolation

z\sim 8.1

Observational constraints on electromagnetic Born-Infeld cosmology

. In this model the dark sector of the cosmic substratum is a viscous fluid with pressure

First cosmological constraints on the superfluid Chaplygin gas model

p= -\zeta \theta

Observational constraints on the unified dark matter and dark energy model based on the quark bag model

, where

Parameter estimation of a nonlinear magnetic universe from observations

\theta

Observational constraints from supernovae Ia and gamma-ray bursts on a clumpy universe

is the fluid-expansion scalar and

Possible geometrical origin of the accelerated expansion of the Universe

\zeta

Confronting Born-Infeld cosmology with observations

is the coefficient of bulk viscosity. Using the sample of 59 high-redshift GRBs reported by Wei (2010), we calibrate GRBs at low redshifts with the Union 2 sample of SNe Ia, avoiding then the circularity problem. Testing the constant bulk viscosity model with GRBs we found the best fit for the viscosity parameter

Testing a DBI model for the unification of dark matter and dark energy with gamma-ray bursts

\tilde{\zeta}