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Published August 15, 2006 | Published
Journal Article Open

Cosmological bounds on dark-matter-neutrino interactions


We investigate the cosmological effects of a neutrino interaction with cold dark-matter. We postulate a neutrino that interacts with a "neutrino-interacting dark-matter" (NIDM) particle with an elastic-scattering cross section that either decreases with temperature as T2 or remains constant with temperature. The neutrino-dark-matter interaction results in a neutrino-dark-matter fluid with pressure, and this pressure results in diffusion-damped oscillations in the matter power spectrum, analogous to the acoustic oscillations in the baryon-photon fluid. We discuss the bounds from the Sloan Digital Sky Survey on the NIDM opacity (ratio of cross section to NIDM-particle mass) and compare with the constraint from observation of neutrinos from supernova 1987A. If only a fraction of the dark matter interacts with neutrinos, then NIDM oscillations may affect current cosmological constraints from measurements of galaxy clustering. We discuss how detection of NIDM oscillations would suggest a particle-antiparticle asymmetry in the dark-matter sector.

Additional Information

© 2006 The American Physical Society. (Received 13 June 2006; published 15 August 2006) We acknowledge the use of the publicly available numerical code CMBFAST. G.M. is pleased to thank P.D. Serpico for discussions. A.M. is supported by MURST through COFIN Contract No. 2004027755 and by ALFAEC funds in the framework of Program HELEN (High Energy Physics Latinoamerican-European Network). M.K. is supported by DOE No. DE-FG03-92-ER40701, NASA No. NNG05GF69G, and the Gordon and Betty Moore Foundation.

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