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Title: Constraining dark matter-neutrino interactions using the CMB and large-scale structure

We present a new study on the elastic scattering cross section of dark matter (DM) and neutrinos using the latest cosmological data from Planck and large-scale structure experiments. We find that the strongest constraints are set by the Lyman-α forest, giving σ{sub DM−ν} ∼< 10{sup −33}(m{sub DM}/GeV) cm{sup 2} if the cross section is constant and a present-day value of σ{sub DM−ν} ∼< 10{sup −45}(m{sub DM}/GeV) cm{sup 2} if it scales as the temperature squared. These are the most robust limits on DM-neutrino interactions to date, demonstrating that one can use the distribution of matter in the Universe to probe dark (''invisible{sup )} interactions. Additionally, we show that scenarios involving thermal MeV DM and a constant elastic scattering cross section naturally predict (i) a cut-off in the matter power spectrum at the Lyman-α scale, (ii) N{sub eff} ∼ 3.5 ± 0.4, (iii) H{sub 0} ∼ 71 ± 3km s{sup −1}Mpc{sup −1} and (iv) the possible generation of neutrino masses.
Authors:
;  [1] ;  [2]
  1. Institute for Particle Physics Phenomenology, Durham University, Durham, DH1 3LE (United Kingdom)
  2. LAPTH, U. de Savoie, CNRS, BP 110, 74941 Annecy-Le-Vieux (France)
Publication Date:
OSTI Identifier:
22373603
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 05; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CROSS SECTIONS; ELASTIC SCATTERING; MEV RANGE; NEUTRINOS; NONLUMINOUS MATTER; SPECTRA; UNIVERSE