Super heavy thermal dark matter

Abstract

We propose a mechanism of elementary thermal dark matter with mass up to 10 14 GeV, within a standard cosmological history, whose relic abundance is determined solely by its interactions with the Standard Model, without violating the perturbative unitarity bound. The dark matter consists of many nearly degenerate particles which scatter with the Standard Model bath in a nearest-neighbor chain, and maintain chemical equilibrium with the Standard Model bath by in-equilibrium decays and inverse decays. The phenomenology includes super heavy elementary dark matter and heavy relics that decay at various epochs in the cosmological history, with implications for CMB, structure formation and cosmic ray experiments.

Coscattering in next-to-minimal dark matter and split supersymmetry

“…Having the dark matter relic abundance dictated by the freeze-out of inelastic scattering processes rather than of coannihilations has been dubbed "coscattering" in [2]. This mechanism has since been explored in the context of several different models [6][7][8].…”

Co-SIMP Miracle

“…It is important to consider other possibilities [14][15][16][17][18][19][20][21]. Recent work [17,21] has made the simple but ingenious point that the process χ + χ + χ → χ + χ is efficient in the early universe if the interactions are strong, setting the relic abundance while involving only dark-matter processes, hence the name strongly interacting massive particle (SIMP).…”