Cosmological bounds on dark matter-neutrino interactions
Abstract
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 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.
Cite
@article{arxiv.astro-ph/0606190,
title = {Cosmological bounds on dark matter-neutrino interactions},
author = {Gianpiero Mangano and Alessandro Melchiorri and Paolo Serra and Asantha Cooray and Marc Kamionkowski},
journal= {arXiv preprint arXiv:astro-ph/0606190},
year = {2009}
}