Superheavy Dark Matter from String Theory
  Explicit string models which can realize inflation and low-energy
supersymmetry are notoriously difficult to achieve. Given that sequestering
requires very specific configurations, supersymmetric particles are in general
expected to be very heavy implying that the neutralino dark matter should be
overproduced in a standard thermal history. However, in this paper we point out
that this is generically not the case since early matter domination driven by
string moduli can dilute the dark matter abundance down to the observed value.
We argue that generic features of string compactifications, namely a high
supersymmetry breaking scale and late time epochs of modulus domination, might
imply superheavy neutralino dark matter with mass around $10^{10}-10^{11}$ GeV.
Interestingly, this is the right range to explain the recent detection of
ultra-high-energy neutrinos by IceCube and ANITA via dark matter decay.
