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Title: Bound-state formation for thermal relic dark matter and unitarity

We show that the relic abundance of thermal dark matter annihilating via a long-range interaction, is significantly affected by the formation and decay of dark matter bound states in the early universe, if the dark matter mass is above a few TeV . We determine the coupling required to obtain the observed dark matter density, taking into account both the direct 2-to-2 annihilations and the formation of bound states, and provide an analytical fit. We argue that the unitarity limit on the inelastic cross-section is realized only if dark matter annihilates via a long-range interaction, and we determine the upper bound on the mass of thermal-relic dark matter to be about 197 (139) TeV for (non)-self-conjugate dark matter.
Authors:
 [1] ;  [2]
  1. SISSA and INFN, Via Bonomea 265, 34136 Trieste (Italy)
  2. Nikhef, Science Park 105, 1098 XG Amsterdam (Netherlands)
Publication Date:
OSTI Identifier:
22382068
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 12; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABUNDANCE; ANNIHILATION; BOUND STATE; COUPLING; CROSS SECTIONS; DECAY; DENSITY; INTERACTION RANGE; MASS; NONLUMINOUS MATTER; TEV RANGE 100-1000; UNITARITY; UNIVERSE