Constraining Born-Infeld models of dark energy with CMB anisotropies

Details Constraining Born-Infeld models of dark energy with CMB anisotropies Constraining Born-Infeld models of dark energy with CMB anisotropies

2004-05-03

arxiv.org/abs/astro-ph/0405041v1

Phys.Rev. D70 (2004) 063517

Astronomy and Astrophysics

Astrophysics

5 pages, 4 figures, uses revtex4

Scientific paper

10.1103/PhysRevD.70.063517

We study the CMB constraints on two Dark Energy models described by scalar fields with different Lagrangians, namely a Klein-Gordon and a Born-Infeld field. The speed of sound of field fluctuations are different in these two theories, and therefore the predictions for CMB and structure formation are different. Employing the WMAP data on CMB, we make a likelihood analysis on a grid of theoretical models. We constrain the parameters of the models and compute the probability distribution functions for the equation of state. We show that the effect of the different sound speeds affects the low multipoles of CMB anisotropies, but is at most marginal for the class of models studied here.

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