Introducing the Dirac-Milne universe

Details Introducing the Dirac-Milne universe Introducing the Dirac-Milne universe

2011-10-13

arxiv.org/abs/1110.3054v2

Astronomy & Astrophysics, Volume 537, id.A78, 2012

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Replaced to match published version

Scientific paper

10.1051/0004-6361/201016103

The \Lambda CDM standard model, although an excellent parametrization of the present cosmological data, requires two as yet unobserved components, Dark Matter and Dark Energy, for more than 95% of the Universe. Faced to this unsatisfactory situation, we study an unconventional cosmology, the Dirac-Milne universe, a matter-antimatter symmetric cosmology, in which antimatter is supposed to present a negative active gravitational mass. The main feature of this cosmology is the linear evolution of the scale factor with time which directly solves the age and horizon problems of a matter-dominated universe. We study the concordance of this model to the cosmological test of Type Ia Supernov\ae\ distance measurements and calculate the theoretical primordial abundances of light elements for this cosmology. We also show that the acoustic scale of the Cosmic Microwave Background naturally emerges at the degree scale despite an open geometry.

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