Dark energy and the Boomerang data

Details Dark energy and the Boomerang data Dark energy and the Boomerang data

2000-06-21

arxiv.org/abs/astro-ph/0006300v2

Phys.Rev.Lett.86:196-199,2001

Astronomy and Astrophysics

Astrophysics

seven pages, two figures. Minor revision to match version accepted in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.86.196

The recent high-quality Boomerang data allow to test many competing cosmological models. Here I present a seven-parameter likelihood analysis of dark energy models with exponential potential and explicit coupling to dark matter. Such a model is conformally equivalent to a scalar field with non-minimal coupling to gravity. So far, the constraints on a dark energy - dark matter coupling were extremely weak. The Boomerang data constrain the dimensionless coupling $\beta $ to be smaller than 0.1, an order of magnitude better than previous limits. In terms of the constant $\xi $ of non-minimally coupled theories, this amounts to $\xi <0.01.$ On the other hand, Boomerang has not enough sensitivity to put constraints on the potential slope.

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