Abstract
We propose a mechanism of elementary thermal dark matter with a mass up to 1014 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 the cosmic microwave background, structure formation, and cosmic ray experiments.
| Original language | American English |
|---|---|
| Article number | 191801 |
| Journal | Physical Review Letters |
| Volume | 123 |
| Issue number | 19 |
| DOIs | |
| State | Published - 8 Nov 2019 |
Bibliographical note
Funding Information:We are grateful to Tim Cohen, Raffaele D'Agnolo, Jared Evans, Yuval Grossman, Kenny C. Y. Ng, Jinhong Park, Josh Ruderman, Juri Smirnov, and the Weizmann Institute HEP lunch group for useful discussions. We especially thank Yonit Hochberg for useful discussions and comments on the manuscript. The work of E. K. is supported by the Israel Science Foundation (Grant No. 1111/17), by the Binational Science Foundation (Grant No. 2016153), and by the I-CORE Program of the Planning Budgeting Committee (Grant No. 1937/12).
Funding Information:
In this Letter, we presented a new freeze-out mechanism for super heavy DM that freezes out with the SM within a standard cosmological history. The relic abundance is determined solely via its interactions with the SM. For a velocity-independent cross section, we showed the DM mass could be as large as m ∼ 10 14 GeV within the perturbative unitary limit. In an upcoming Letter, we show how velocity-dependent interactions, such as if the scattering was mediated by a light mediator, allow for DM to be as heavy as the Planck scale [25] . We are grateful to Tim Cohen, Raffaele D’Agnolo, Jared Evans, Yuval Grossman, Kenny C. Y. Ng, Jinhong Park, Josh Ruderman, Juri Smirnov, and the Weizmann Institute HEP lunch group for useful discussions. We especially thank Yonit Hochberg for useful discussions and comments on the manuscript. The work of E. 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© 2019 authors. Published by the American Physical Society.