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Article overview
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Dark Radiation or Warm Dark Matter from long lived particle decays in the light of Planck | Pasquale Di Bari
; Stephen F. King
; Alexander Merle
; | Date: |
25 Mar 2013 | Abstract: | Although Planck data supports the standard Lambda CDM model, it still allows
for the presence of Dark Radiation corresponding up to about half an extra
standard neutrino species. We propose a scenario for obtaining a fractional
"effective neutrino species" from a thermally produced particle which decays
into a much lighter stable relic plus standard fermions. At lifetimes much
longer than 1 sec, both the relic particles and the non-thermal neutrino
component contribute to Dark Radiation. By increasing the stable-to-unstable
particle mass ratio, the relic particle no longer acts as Dark Radiation but
instead becomes a candidate for Warm Dark Matter with mass O(1keV - 100GeV). In
both cases it is possible to address the lithium problem. | Source: | arXiv, 1303.6267 | Services: | Forum | Review | PDF | Favorites |
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