Relic density and CMB constraints on dark matter annihilation with Sommerfeld enhancement

Journal Article · Thu Apr 15 00:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.083502· OSTI ID:21409560

Zavala, Jesus; White, Simon D. M. ^[1]; Vogelsberger, Mark ^[1]

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1. Max-Planck-Institut fuer Astrophysik, Karl-Schwarzschild-Strasse 1, 85740 Garching (Germany)

We calculate how the relic density of dark matter particles is altered when their annihilation is enhanced by the Sommerfeld mechanism due to a Yukawa interaction between the annihilating particles. Maintaining a dark matter abundance consistent with current observational bounds requires the normalization of the s-wave annihilation cross section to be decreased compared to a model without enhancement. The level of suppression depends on the specific parameters of the particle model, with the kinetic decoupling temperature having the most effect. We find that the cross section can be reduced by as much as an order of magnitude for extreme cases. We also compute the {mu}-type distortion of the CMB energy spectrum caused by energy injection from such Sommerfeld-enhanced annihilation. Our results indicate that in the vicinity of resonances, associated with bound states, distortions can be large enough to be excluded by the upper limit |{mu}|{<=}9.0x10{sup -5} found by the FIRAS (Far Infrared Absolute Spectrophotometer) instrument on the COBE (Cosmic Background Explorer) satellite.

• OSTI ID: 21409560
• Journal Information: Physical Review. D, Particles Fields, Vol. 81, Issue 8; Other Information: DOI: 10.1103/PhysRevD.81.083502; (c) 2010 The American Physical Society; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ANNIHILATION
BOUND STATE
CROSS SECTIONS
DECOUPLING
DENSITY
ENERGY SPECTRA
EXPLORER SATELLITES
NONLUMINOUS MATTER
PARTICLE MODELS
RELICT RADIATION
RESONANCE
S WAVES
SIMULATION
SPECTROPHOTOMETERS
YUKAWA POTENTIAL
ELECTROMAGNETIC RADIATION
INTERACTIONS
MATHEMATICAL MODELS
MATTER
MEASURING INSTRUMENTS
MICROWAVE RADIATION
NUCLEAR POTENTIAL
PARTIAL WAVES
PARTICLE INTERACTIONS
PHYSICAL PROPERTIES
POTENTIALS
RADIATIONS
SATELLITES
SPECTRA