Volume 537, January 2012
|Number of page(s)||12|
|Section||Cosmology (including clusters of galaxies)|
|Published online||11 January 2012|
Introducing the Dirac-Milne universe
1 UPMC-CNRS, UMR 7095, Institut d’Astrophysique de Paris, 75014 Paris, France
2 CSNSM, Université Paris-Sud, CNRS-IN2P3, 91405 Orsay, France
Received: 9 November 2010
Accepted: 7 October 2011
The ΛCDM standard model, although an excellent parametrization of the present cosmological data, contains two as yet unobserved components, dark matter and dark energy, that constitute more than 95% of the Universe. Faced with 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 supernovae 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.
Key words: cosmology: theory / dark energy / primordial nucleosynthesis / dark matter
© ESO, 2012
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.