Superheavy WIMP dark matter from incomplete thermalization
Nobuchika Okada, Osamu Seto
Abstract
Although it is usually thought that a class of weakly interacting massive particle (WIMP) dark matters (DMs), which have the vector coupling with the Z boson, is denied by null results of the direct DM searches, such WIMP DMs are still viable if they are superheavy with the mass of mDM≳109 GeV. In the future, the superheavy WIMP DMs can be searched up to mDM≃1012 GeV, which corresponds to the so-called neutrino floor limit. We show that the observed abundance of ΩDMh2≃0.1 for a superheavy WIMP DM can be reproduced by a suitable reheating temperature of TR≃mDM/29 after inflation, if the direct inflaton decay into DM is negligible or kinematically forbidden.
Topics & Concepts
PhysicsWIMPParticle physicsMassive particleDark matterInflatonWeakly interacting massive particlesNeutrinoNuclear physicsCosmologyScalar field dark matterAstrophysicsInflation (cosmology)Dark energyAstronomyDark Matter and Cosmic PhenomenaCosmology and Gravitation TheoriesParticle physics theoretical and experimental studies