title: Constraints on light dark matter from core-collapse supernovae.
abstract: We show that light (approximately or = 1-30 MeV) dark matter particles can play a significant role in core-collapse supernovae, if they have relatively large annihilation and scattering cross sections, as compared to neutrinos. We find that if such particles are lighter than approximately or = 10 MeV and reproduce the observed dark matter relic density, supernovae would cool on a much longer time scale and would emit neutrinos with significantly smaller energies than in the standard scenario, in disagreement with observations. This constraint may be avoided, however, in certain situations for which the neutrino-dark-matter scattering cross sections remain comparatively small.
authors.affiliation: Laboratoire de Physique Théorique de l'ENS, UMR 8549 CNRS, 24 rue Lhomond, 75231 Paris Cedex 05, France.
authors.forename: Pierre
authors.initials: P
authors.lastname: Fayet
authors.forename: Dan
authors.initials: D
authors.lastname: Hooper
authors.forename: Günter
authors.initials: G
authors.lastname: Sigl