On different approaches to freeze-in and freeze-out leptogenesis with quasi-degenerate neutrinos
Abstract We compare two approaches for determining the generation of lepton asymmetry during production and decay of quasi-degenerate neutrinos, namely the density matrix formalism and a recent proposal which does not involve any counting of neutrino number densities and is based on plugging the res...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2023-02-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | https://doi.org/10.1140/epjc/s10052-023-11321-4 |
| _version_ | 1797853647268216832 |
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| author | J. Racker |
| author_facet | J. Racker |
| author_sort | J. Racker |
| collection | DOAJ |
| description | Abstract We compare two approaches for determining the generation of lepton asymmetry during production and decay of quasi-degenerate neutrinos, namely the density matrix formalism and a recent proposal which does not involve any counting of neutrino number densities and is based on plugging the resummed propagator in a quantum field theory model for neutrino oscillations. We show numerically and analytically that they are almost equivalent for small mass splittings and also discuss the hierarchical limit. The comparison, performed in a simple scalar toy model, helps to understand several issues that have been discussed in the literature. |
| first_indexed | 2024-04-09T19:52:55Z |
| format | Article |
| id | doaj.art-4d0dd84bbec543cc88c03182c4eb1a68 |
| institution | Directory Open Access Journal |
| issn | 1434-6052 |
| language | English |
| last_indexed | 2024-04-09T19:52:55Z |
| publishDate | 2023-02-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-4d0dd84bbec543cc88c03182c4eb1a682023-04-03T05:37:44ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60522023-02-018321810.1140/epjc/s10052-023-11321-4On different approaches to freeze-in and freeze-out leptogenesis with quasi-degenerate neutrinosJ. Racker0Instituto de Astronomía Teórica y Experimental (IATE), Universidad Nacional de Córdoba (UNC)-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)Abstract We compare two approaches for determining the generation of lepton asymmetry during production and decay of quasi-degenerate neutrinos, namely the density matrix formalism and a recent proposal which does not involve any counting of neutrino number densities and is based on plugging the resummed propagator in a quantum field theory model for neutrino oscillations. We show numerically and analytically that they are almost equivalent for small mass splittings and also discuss the hierarchical limit. The comparison, performed in a simple scalar toy model, helps to understand several issues that have been discussed in the literature.https://doi.org/10.1140/epjc/s10052-023-11321-4 |
| spellingShingle | J. Racker On different approaches to freeze-in and freeze-out leptogenesis with quasi-degenerate neutrinos European Physical Journal C: Particles and Fields |
| title | On different approaches to freeze-in and freeze-out leptogenesis with quasi-degenerate neutrinos |
| title_full | On different approaches to freeze-in and freeze-out leptogenesis with quasi-degenerate neutrinos |
| title_fullStr | On different approaches to freeze-in and freeze-out leptogenesis with quasi-degenerate neutrinos |
| title_full_unstemmed | On different approaches to freeze-in and freeze-out leptogenesis with quasi-degenerate neutrinos |
| title_short | On different approaches to freeze-in and freeze-out leptogenesis with quasi-degenerate neutrinos |
| title_sort | on different approaches to freeze in and freeze out leptogenesis with quasi degenerate neutrinos |
| url | https://doi.org/10.1140/epjc/s10052-023-11321-4 |
| work_keys_str_mv | AT jracker ondifferentapproachestofreezeinandfreezeoutleptogenesiswithquasidegenerateneutrinos |