Journal
PHYSICS LETTERS B
Volume 669, Issue 2, Pages 145-149Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2008.09.049
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Funding
- DFG cluster of excellence Origin and Structure of the Universe
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- US Department of Energy [DE-AC03-76SF00098]
- National Science Foundation [PHY-04-57315]
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We investigate the possibility that both the baryon asymmetry of the universe and the observed cold dark matter density are generated by decays of a heavy scalar field which dominates the universe before nucleosynthesis. Since baryons and cold dark matter have common origin, this mechanism yields a natural explanation of the similarity of the corresponding energy densities. The cosmological moduli and gravitino problems are avoided. (C) 2008 Elsevier B.V. All rights reserved.
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