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Dark Radiation or Warm Dark Matter from long lived particle decays in the light of Planck

Dark Radiation or Warm Dark Matter from long lived particle decays in the light of Planck
Dark Radiation or Warm Dark Matter from long lived particle decays in the light of Planck
Although Planck data supports the standard ?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 s, 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(1 keV–100 GeV)O(1 keV–100 GeV). In both cases it is possible to address the lithium problem.
0370-2693
77-83
Di Bari, Pasquale
3fe21e59-0eff-41bc-8faa-fdd817146418
King, Stephen F.
f8c616b7-0336-4046-a943-700af83a1538
Merle, Alexander
18b2b79d-5edb-4087-bf76-86050237604b
Di Bari, Pasquale
3fe21e59-0eff-41bc-8faa-fdd817146418
King, Stephen F.
f8c616b7-0336-4046-a943-700af83a1538
Merle, Alexander
18b2b79d-5edb-4087-bf76-86050237604b

Di Bari, Pasquale, King, Stephen F. and Merle, Alexander (2013) Dark Radiation or Warm Dark Matter from long lived particle decays in the light of Planck. Physics Letters B, 724 (1-3), 77-83. (doi:10.1016/j.physletb.2013.06.003).

Record type: Article

Abstract

Although Planck data supports the standard ?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 s, 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(1 keV–100 GeV)O(1 keV–100 GeV). In both cases it is possible to address the lithium problem.

Other
1-s2.0-S037026931300467X-main.pdf__tid=f8397632-431f-11e4-871c-00000aab0f27&acdnat=1411476711_998d90fa9f9b7e4fc03773c3c469cf86 - Version of Record
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Published date: July 2013
Organisations: Physics & Astronomy

Identifiers

Local EPrints ID: 369299
URI: http://eprints.soton.ac.uk/id/eprint/369299
ISSN: 0370-2693
PURE UUID: 8c834b1c-9eca-47f6-867b-cb85ad6bbcee

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Date deposited: 23 Sep 2014 12:49
Last modified: 19 Jul 2019 21:01

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