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We show that hidden hot dark matter, hidden-sector dark matter withinteractions that decouple when it is relativistic, is a viable dark mattercandidate provided it has never been in thermal equilibrium with the particlesof the standard model. This hidden hot dark matter may reheat to a lowertemperature and number density than the visible Universe and thus account,simply with its thermal abundance, for all the dark matter in the Universewhile evading the typical constraints on hot dark matter arising from structureformation. We find masses ranging from ~3 keV to ~10 TeV. While never inequilibrium with the standard model, this class of models may have uniqueobservational signatures in the matter power spectrum or via extra-weakinteractions with standard model particles.

Hidden Hot Dark Matter as Cold Dark Matter