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APS » Journals » Phys. Rev. Lett. » Volume 98 » Issue 16
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Phys. Rev. Lett. 98, 161304 (2007) [4 pages]

Axino Dark Matter from Q-Balls in Affleck-Dine Baryogenesis and the Ωb-ΩDM Coincidence Problem

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Leszek Roszkowski1 and Osamu Seto2,*
1Department of Physics and Astronomy, University of Sheffield, Sheffield, United Kingdom
2Department of Physics and Astronomy, University of Sussex, Brighton BN1 9QJ, United Kingdom

Received 10 July 2006; revised 8 February 2007; published 19 April 2007

We show that the Ωb-ΩDM coincidence can naturally be explained in a framework where axino is cold dark matter which is predominantly produced in nonthermal processes involving decays of Q-balls formed in Affleck-Dine baryogenesis. In this approach, the similarity of Ωb and ΩDM is a direct consequence of the (sub-)GeV scale of the mass of the axino, while the reheating temperature TR must be low, some 102  GeV, or less.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.161304
DOI:
10.1103/PhysRevLett.98.161304
PACS:
95.35.+d, 12.60.Jv, 14.80.Ly, 98.80.Cq

*Present address: Instituto de Física Teórica, Universidad Autónoma de Madrid, Cantoblanco, Madrid 28049, Spain.

 
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