Baryon Asymmetry and Dark Matter

Abstract

We study the implications of a large baryogenesis temperature, $T_B=O(10^{10}$ GeV), on the mass spectrum of superparticles in supersymmetric extensions of the standard model. Models with a neutralino as lightest superparticle (LSP) are excluded. A consistent picture is obtained with the gravitino as LSP, followed by a higgsino-like neutralino (NSP). Gravitinos with masses from 10 to 100 GeV may be the dominant component of dark matter.

Comments: 10 pages, 2 figures included, eq. (13) replaced by leading order approximation