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Probing relic neutrino decays with 21 cm cosmology

Probing relic neutrino decays with 21 cm cosmology
Probing relic neutrino decays with 21 cm cosmology
We show how 21 cm cosmology can test relic neutrino radiative decays into sterile neutrinos. Using recent EDGES results, we derive constraints on the lifetime of the decaying neutrinos. If the EDGES anomaly will be confirmed, then there are two solutions, one for much longer and one for much shorter lifetimes than the age of the universe, showing how relic neutrino radiative decays can explain the anomaly in a simple way. We also show how to combine EDGES results with those from radio background observations, showing that potentially the ARCADE 2 excess can be also reproduced together with the EDGES anomaly within the proposed non-standard cosmological scenario. Our calculation of the specific intensity at the redshifts probed by EDGES can be also applied to the case of decaying dark matter.
0370-2693
64-70
Chianese, Marco
73113e4b-5eb5-4cdc-831b-90f4678588d6
Di Bari, Pasquale
3fe21e59-0eff-41bc-8faa-fdd817146418
Farrag, Kareem, Ramadan Hassan Aly Muhammad
0d181def-4c75-40d8-b872-3d0a51ca8892
Samanta, Rome
8016c2a4-1a27-448c-86bc-d2e4aff88737
Chianese, Marco
73113e4b-5eb5-4cdc-831b-90f4678588d6
Di Bari, Pasquale
3fe21e59-0eff-41bc-8faa-fdd817146418
Farrag, Kareem, Ramadan Hassan Aly Muhammad
0d181def-4c75-40d8-b872-3d0a51ca8892
Samanta, Rome
8016c2a4-1a27-448c-86bc-d2e4aff88737

Chianese, Marco, Di Bari, Pasquale, Farrag, Kareem, Ramadan Hassan Aly Muhammad and Samanta, Rome (2019) Probing relic neutrino decays with 21 cm cosmology. Physics Letters B, 790, 64-70. (doi:10.1016/j.physletb.2018.09.040).

Record type: Article

Abstract

We show how 21 cm cosmology can test relic neutrino radiative decays into sterile neutrinos. Using recent EDGES results, we derive constraints on the lifetime of the decaying neutrinos. If the EDGES anomaly will be confirmed, then there are two solutions, one for much longer and one for much shorter lifetimes than the age of the universe, showing how relic neutrino radiative decays can explain the anomaly in a simple way. We also show how to combine EDGES results with those from radio background observations, showing that potentially the ARCADE 2 excess can be also reproduced together with the EDGES anomaly within the proposed non-standard cosmological scenario. Our calculation of the specific intensity at the redshifts probed by EDGES can be also applied to the case of decaying dark matter.

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Submitted date: 2018
Accepted/In Press date: 19 September 2018
e-pub ahead of print date: 21 September 2018
Published date: 10 March 2019

Identifiers

Local EPrints ID: 421527
URI: https://eprints.soton.ac.uk/id/eprint/421527
ISSN: 0370-2693
PURE UUID: 117218e8-fb7b-4b54-a8bf-3e9df12037c5

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Date deposited: 14 Jun 2018 16:30
Last modified: 21 Mar 2019 17:30

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Author: Marco Chianese
Author: Rome Samanta

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