Supersymmetric superheavy dark matter

Abstract

We propose the lightest supersymmetric particle (LSP) as a well-suited candidate for superheavy dark matter (SHDM). Various production mechanisms at the end of inflation can produce SHDM with the correct abundance, ${\ensuremath{\Omega}}_{\mathrm{LSP}}{h}^{2}\ensuremath{\sim}0.1$, if its mass is sufficiently high. In particular, gravitational production requires that the mass ${m}_{\mathrm{LSP}}$ of the LSP is above $3\ifmmode\times\else\texttimes\fi{}{10}^{11}\text{ }\text{ }\mathrm{GeV}$. Weak interactions remain perturbative despite the large mass hierarchy, ${m}_{\mathrm{LSP}}\ensuremath{\gg}{m}_{Z}$, because of the special decoupling properties of supersymmetry. As a result the model is predictive and we discuss the relevant cosmological processes for the case of a superheavy neutralino within this scheme.