Elsevier

Nuclear Physics B

Volume 358, Issue 2, 15 July 1991, Pages 447-470
Nuclear Physics B

Cosmological implications of axinos

https://doi.org/10.1016/0550-3213(91)90355-2Get rights and content

Abstract

Aximos are the supersymmetric partners of axions. They arise in models incorporating both low-energy supersymmetry and the axion solution of the strong CP problem. In the present state of knowledge several of the key properties of aximos, which control their cosmological consequences, are poorly determined. But generically there are very significant cosmological consequences, and we attempt to survey the possibilities here. In a wide variety of models the aximo is the lightest R-odd particle, and destabilizes the more conventional candidates for this title (photino, higgsino,...) on cosmological time scales. While this consideration perhaps casts some shadow over an important class of dark matter candidates, it turns out that in a large class of models the axino itself becomes a plausible dark matter candidate. In other models the axino is heavy, and unstable. Even then axinos are of cosmological interest, because their decay can be the dominant mechanism for production of the lightest R-odd particle.

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Research supported in part by a Natural Sciences and Engineering Research Council of Canada 1967 Scholarship.

∗∗

Research supported in part by the DOE (at Chicago).

∗∗∗

Research supported in part by DOE contract DE-AC02-76ERO222.

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