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A scalar particle with a relic density set by annihilations through a Higgsportal operator is a simple and minimal possibility for dark matter. However,assuming a thermal cosmological history this model is ruled out over most ofparameter space by collider and direct detection constraints. We show that intheories with a non-thermal cosmological history Higgs portal dark matter isviable for a wide range of dark matter masses and values of the portalcoupling, evading existing limits. In particular, we focus on the string theorymotivated scenario of a period of late time matter domination due to a lightmodulus with a decay rate that is suppressed by the Planck scale. Dark matterwith a mass < GeV is possible without additional hidden sector states, and thiscan have astrophysically relevant self-interactions. We also study thesignatures of such models at future direct, indirect, and collider experiments.Searches for invisible Higgs decays at the high luminosity LHC or an e+ e-collider could cover a significant proportion of the parameter space for lowmass dark matter, and future direct detection experiments will play acomplementary role.

Higgs portal dark matter in non-thermal cosmologies