Thermal dark matter from a highly decoupled sector

Berlin, Asher; Hooper, Dan; Krnjaic, Gordan

doi:10.1103/PhysRevD.94.095019

Title: Thermal dark matter from a highly decoupled sector

Journal Article · Thu Nov 17 00:00:00 EST 2016 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.94.095019· OSTI ID:1341882

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Univ. of Chicago, Chicago, IL (United States)
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); The Univ. of Chicago, Chicago, IL (United States)
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

It has recently been shown that if the dark matter is in thermal equilibrium with a sector that is highly decoupled from the Standard Model, it can freeze out with an acceptable relic abundance, even if the dark matter is as heavy as ~1–100 PeV. In such scenarios, both the dark and visible sectors are populated after inflation, but with independent temperatures. The lightest particle in the dark sector will be generically long-lived and can come to dominate the energy density of the Universe. Upon decaying, these particles can significantly reheat the visible sector, diluting the abundance of dark matter and thus allowing for dark matter particles that are much heavier than conventional WIMPs. In this study, we present a systematic and pedagogical treatment of the cosmological history in this class of models, emphasizing the simplest scenarios in which a dark matter candidate annihilates into hidden sector particles which then decay into visible matter through the vector, Higgs, or lepton portals. In each case, we find ample parameter space in which very heavy dark matter particles can provide an acceptable thermal relic abundance. We also discuss possible extensions of models featuring these dynamics.

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Research Organization:: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1341882

Alternate ID(s):: OSTI ID: 1332595

Report Number(s):: FERMILAB-PUB-16-318-A; arXiv:1609.02555; PRVDAQ; 1486023; TRN: US1701240

Journal Information:: Physical Review D, Vol. 94, Issue 9; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 92 works

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Hidden sector dark matter and the Galactic Center gamma-ray excess: a closer look

Journal Article · Fri Nov 24 00:00:00 EST 2017 · Journal of Cosmology and Astroparticle Physics · OSTI ID:1341882

Escudero, Miguel; Witte, Samuel J.; Hooper, Dan

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79 ASTRONOMY AND ASTROPHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Title: Thermal dark matter from a highly decoupled sector

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