Bound-state formation for thermal relic dark matter and unitarity - INSPIRE

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Bound-state formation for thermal relic dark matter and unitarity

Benedict von Harling
(
- SISSA, Trieste and
- INFN, Trieste
)
,
Kalliopi Petraki
(
- NIKHEF, Amsterdam
)

Jul 29, 2014

7 pages

Published in:

JCAP 12 (2014) 033

Published: Dec 16, 2014

e-Print:

1407.7874 [hep-ph]

DOI:

10.1088/1475-7516/2014/12/033

Report number:

NIKHEF-2014-018

View in:

ADS Abstract Service

reference search172 citations

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Abstract: (IOP)

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.

Note:

v2: 15 pages, 5 figures, 1 table. Expanded discussion (also with respect to the published version). Effect on dark matter density shown, numerical fit for the coupling provided, timeline plot added. Results unchanged

dark matter theory
particle physics - cosmology connection
physics of the early universe
cosmology of theories beyond the SM
bound state: formation
interaction: long-range
dark matter: mass
dark matter: density
dark matter: decay
relic density: thermal

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