Solving the Gravitino Problem by Axino
arXiv:hep-ph/0006211 · doi:10.1016/S0370-2693(00)01209-0
Abstract
In a large class of supersymmetric (SUSY) axion model the mass of axino $\axino$ (a fermionic superpartner of the axion) is predicted as $m_{\axino} \lesssim {\cal O}(1)$ keV. Thus, the axino is the lightest SUSY particle (LSP). We pointed out that such a light axino provides a natural solution to the gravitino problem, if the gravitino is the next LSP. We derive a constraint on the reheating temperature of inflation, GeV for the gravitino mass GeV, which is much weaker than that obtained in the minimal SUSY standard model.
7 pages; revised version for publication in Phys. Lett. B
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