skip to main content

Title: A lower bound on the mass of cold thermal dark matter from Planck

We show that the new measurement of the effective number of neutrinos (N{sub eff}) by the Planck satellite can be used to set a robust lower bound on the mass of cold thermal dark matter of O(MeV). Our limit applies if the dark matter remains in thermal equilibrium by coupling to electrons and photons or through interactions with neutrinos, and applies regardless of whether the dark matter annihilation cross-section is s-wave or p-wave. To illustrate our bounds we apply them to a model of a supersymmetric neutralino annihilating to neutrinos, via a light mixed left-right handed sneutrino mediator. While this scenario was not constrained by previous data, the Planck limits on N{sub eff} allow us to set a lower bound on the neutralino dark matter mass of 3.5 MeV.
Authors:
; ;  [1]
  1. Institute for Particle Physics Phenomenology, Durham University, South Road, Durham, DH1 3LE (United Kingdom)
Publication Date:
OSTI Identifier:
22282733
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2013; Journal Issue: 08; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANNIHILATION; COUPLING; CROSS SECTIONS; ELECTRONS; MASS; MEV RANGE; NEUTRALINOS; NEUTRINOS; NONLUMINOUS MATTER; P WAVES; PHOTONS; S WAVES; SUPERSYMMETRY; THERMAL EQUILIBRIUM; VISIBLE RADIATION