CMB constraints on dark matter models with large annihilation cross section
- Laboratoire Astroparticule et Cosmologie (APC), Universite' Paris Diderot , 75205 PARIS cedex 13 (France)
- Institut de Physique Theorique, CNRS, URA 2306 and CEA/Saclay, F-91191 Gif-sur-Yvette (France)
- Institut d'Astrophysique de Paris, UMR 7095-CNRS Paris, Universite Pierre et Marie Curie, boulevard Arago 98bis, 75014, Paris (France)
- Physics Department and INFN, Universita' di Roma 'La Sapienza', Ple Aldo Moro 2, 00185, Rome (Italy)
The injection of secondary particles produced by dark matter (DM) annihilation around redshift {approx}1000 would inevitably affect the process of recombination, leaving an imprint on cosmic microwave background (CMB) anisotropies and polarization. We show that the most recent CMB measurements provided by the WMAP satellite mission place interesting constraints on DM self-annihilation rates, especially for models that exhibit a large Sommerfeld enhancement of the annihilation cross section, as recently proposed to fit the PAMELA and ATIC results. Furthermore, we argue that upcoming CMB experiments such as Planck, will improve the constraints by at least 1 order of magnitude, thus providing a sensitive probe of the properties of DM particles.
- OSTI ID:
- 21316193
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 80, Issue 2; Other Information: DOI: 10.1103/PhysRevD.80.023505; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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