Cosmological radiation density with non-standard neutrino-electron interactions
Neutrino non-standard interactions (NSI) with electrons are known to alter the picture of neutrino decoupling from the cosmic plasma. NSI modify both flavour oscillations through matter effects, and the annihilation and scattering between neutrinos and electrons and positrons in the thermal plasma....
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| Format: | Article |
| Language: | English |
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Elsevier
2021-09-01
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| Series: | Physics Letters B |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269321004482 |
| _version_ | 1818741036641419264 |
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| author | Pablo F. de Salas Stefano Gariazzo Pablo Martínez-Miravé Sergio Pastor Mariam Tórtola |
| author_facet | Pablo F. de Salas Stefano Gariazzo Pablo Martínez-Miravé Sergio Pastor Mariam Tórtola |
| author_sort | Pablo F. de Salas |
| collection | DOAJ |
| description | Neutrino non-standard interactions (NSI) with electrons are known to alter the picture of neutrino decoupling from the cosmic plasma. NSI modify both flavour oscillations through matter effects, and the annihilation and scattering between neutrinos and electrons and positrons in the thermal plasma. In view of the forthcoming cosmological observations, we perform a precision study of the impact of non-universal and flavour-changing NSI on the effective number of neutrinos, Neff. We present the variation of Neff arising from the different NSI parameters and discuss the existing degeneracies among them, from cosmology alone and in relation to the current bounds from terrestrial experiments. Even though cosmology is generally less sensitive to NSI than these experiments, we find that future cosmological data would provide competitive and complementary constraints for some of the couplings and their combinations. |
| first_indexed | 2024-12-18T01:50:14Z |
| format | Article |
| id | doaj.art-3b0434d17d3c4c499f17570ba2ebf0f1 |
| institution | Directory Open Access Journal |
| issn | 0370-2693 |
| language | English |
| last_indexed | 2024-12-18T01:50:14Z |
| publishDate | 2021-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-3b0434d17d3c4c499f17570ba2ebf0f12022-12-21T21:25:03ZengElsevierPhysics Letters B0370-26932021-09-01820136508Cosmological radiation density with non-standard neutrino-electron interactionsPablo F. de Salas0Stefano Gariazzo1Pablo Martínez-Miravé2Sergio Pastor3Mariam Tórtola4The Oskar Klein Centre for Cosmoparticle Physics, Department of Physics, Stockholm University, SE-106 91 Stockholm, SwedenINFN, Sezione di Torino, Via P. Giuria 1, I-10125 Torino, ItalyInstituto de Física Corpuscular (CSIC-Universitat de València), Parc Científic UV, C/Catedratico José Beltrán, 2, E-46980 Paterna, Spain; Departament de Física Teòrica, Universitat de València, 46100 Burjassot, Spain; Corresponding author at: Instituto de Física Corpuscular (CSIC-Universitat de València), Parc Científic UV, C/Catedrático José Beltrán, 2, E-46980 Paterna, Spain.Instituto de Física Corpuscular (CSIC-Universitat de València), Parc Científic UV, C/Catedratico José Beltrán, 2, E-46980 Paterna, SpainInstituto de Física Corpuscular (CSIC-Universitat de València), Parc Científic UV, C/Catedratico José Beltrán, 2, E-46980 Paterna, Spain; Departament de Física Teòrica, Universitat de València, 46100 Burjassot, SpainNeutrino non-standard interactions (NSI) with electrons are known to alter the picture of neutrino decoupling from the cosmic plasma. NSI modify both flavour oscillations through matter effects, and the annihilation and scattering between neutrinos and electrons and positrons in the thermal plasma. In view of the forthcoming cosmological observations, we perform a precision study of the impact of non-universal and flavour-changing NSI on the effective number of neutrinos, Neff. We present the variation of Neff arising from the different NSI parameters and discuss the existing degeneracies among them, from cosmology alone and in relation to the current bounds from terrestrial experiments. Even though cosmology is generally less sensitive to NSI than these experiments, we find that future cosmological data would provide competitive and complementary constraints for some of the couplings and their combinations.http://www.sciencedirect.com/science/article/pii/S0370269321004482Neutrino interactionsNon-standard neutrino interactionsCosmologyNeutrino oscillations |
| spellingShingle | Pablo F. de Salas Stefano Gariazzo Pablo Martínez-Miravé Sergio Pastor Mariam Tórtola Cosmological radiation density with non-standard neutrino-electron interactions Physics Letters B Neutrino interactions Non-standard neutrino interactions Cosmology Neutrino oscillations |
| title | Cosmological radiation density with non-standard neutrino-electron interactions |
| title_full | Cosmological radiation density with non-standard neutrino-electron interactions |
| title_fullStr | Cosmological radiation density with non-standard neutrino-electron interactions |
| title_full_unstemmed | Cosmological radiation density with non-standard neutrino-electron interactions |
| title_short | Cosmological radiation density with non-standard neutrino-electron interactions |
| title_sort | cosmological radiation density with non standard neutrino electron interactions |
| topic | Neutrino interactions Non-standard neutrino interactions Cosmology Neutrino oscillations |
| url | http://www.sciencedirect.com/science/article/pii/S0370269321004482 |
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