Natural Candidates for Superheavy Dark Matter in String and M Theory

Abstract

We reconsider superheavy dark matter candidates in string and M theory, in view of the possibility that inflation might generate superheavy particles with an abundance close to that required for a near-critical Universe. We argue that cryptons - stable or metastable bound states of matter in the hidden sector - are favoured over other possible candidates in string or $M$ theory, such as the Kaluza-Klein states associated with extra dimensions. We exhibit a specific string model that predicts cryptons as hidden-sector bound states weighing $\sim 10^{12}$ GeV, and discuss their astrophysical observability.

4 pages, revtex, no figure

References in corpus (3)

• Superheavy dark matter
• Ultra-high energy cosmic rays without GZK cutoff
• GUT baryogenesis after preheating: numerical study of the production and decay of X-bosons

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