Early Universe Relics:
Superheavy dark matter can be produced non-thermally after
inflation, for example during reheating.
This specific particle dark matter can be
probed by multi-wavelength observations of its annihilation
products. The latter include gamma-rays, neutrinos, and
radio emission from electrons produced, apart from being
direct decay products, in the hadronic jets from quarks
and gluons in the decay products. Gianfranco Bertone,
Joseph Silk (Oxford) and me have recently started to explore
constraints from the synchrotron emission that are both relevant
for thermally produced weakly interacting dark matter (WIMP)
motivated by supersymmetry, and for non-thermal dark matter.
Constraining and Detecting Non-Thermal Dark Matter
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