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Dynamical evolution of gravitational leptogenesis

Jamie I. McDonald, Graham Shore

Journal of High Energy Physics, Volume: 2020, Issue: 10

Swansea University Author: Graham Shore

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DOI (Published version): 10.1007/jhep10(2020)025

Abstract

Radiatively-induced gravitational leptogenesis is a potential mechanism to explain the observed matter-antimatter asymmetry of the universe. Gravitational tidal effects at the quantum loop level modify the dynamics of the leptons in curved spacetime and may be encoded in a low-energy effective actio...

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Published in: Journal of High Energy Physics
ISSN: 1126-6708 1029-8479
Published: Springer-Nature for SISSA, Trieste, Italy. Springer Science and Business Media LLC 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa55475
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first_indexed 2020-10-21T16:38:08Z
last_indexed 2020-12-12T04:20:03Z
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spelling 2020-12-11T13:37:19.4101126 v2 55475 2020-10-21 Dynamical evolution of gravitational leptogenesis 28a24f55687c82d6f3ee378ead3cf234 Graham Shore Graham Shore true false 2020-10-21 FGSEN Radiatively-induced gravitational leptogenesis is a potential mechanism to explain the observed matter-antimatter asymmetry of the universe. Gravitational tidal effects at the quantum loop level modify the dynamics of the leptons in curved spacetime and may be encoded in a low-energy effective action Seff . It has been shown in previous work how in a high-scale BSM theory the CP odd curvature-induced interactions in Seff modify the dispersion relations of leptons and antileptons differently in an expanding universe, giving rise to an effective chemical potential and a non-vanishing equilibrium lepton-antilepton asymmetry. In this paper, the CP even curvature interactions are shown to break lepton number current conservation and modify the evolution of the lepton number density as the universe expands. These effects are implemented in a generalised Boltzmann equation and used to trace the dynamical evolution of the lepton number density in different cosmological scenarios. The theory predicts a potentially significant gravitationally-induced lepton-antilepton asymmetry at very early times in the evolution of the universe. Journal Article Journal of High Energy Physics 2020 10 Springer Science and Business Media LLC Springer-Nature for SISSA, Trieste, Italy. 1126-6708 1029-8479 Cosmology of Theories beyond the SM, Eective Field Theories 5 10 2020 2020-10-05 10.1007/jhep10(2020)025 COLLEGE NANME Science and Engineering - Faculty COLLEGE CODE FGSEN Swansea University 2020-12-11T13:37:19.4101126 2020-10-21T17:07:50.2620079 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Jamie I. McDonald 1 Graham Shore 2 55475__18870__5ff6b33cfdfe44f58674ffe4cb08b0cd.pdf 55475.pdf 2020-12-11T13:29:59.2220856 Output 989849 application/pdf Version of Record true This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0). true eng http://creativecommons.org/licenses/by/4.0/
title Dynamical evolution of gravitational leptogenesis
spellingShingle Dynamical evolution of gravitational leptogenesis
Graham Shore
title_short Dynamical evolution of gravitational leptogenesis
title_full Dynamical evolution of gravitational leptogenesis
title_fullStr Dynamical evolution of gravitational leptogenesis
title_full_unstemmed Dynamical evolution of gravitational leptogenesis
title_sort Dynamical evolution of gravitational leptogenesis
author_id_str_mv 28a24f55687c82d6f3ee378ead3cf234
author_id_fullname_str_mv 28a24f55687c82d6f3ee378ead3cf234_***_Graham Shore
author Graham Shore
author2 Jamie I. McDonald
Graham Shore
format Journal article
container_title Journal of High Energy Physics
container_volume 2020
container_issue 10
publishDate 2020
institution Swansea University
issn 1126-6708
1029-8479
doi_str_mv 10.1007/jhep10(2020)025
publisher Springer Science and Business Media LLC
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
document_store_str 1
active_str 0
description Radiatively-induced gravitational leptogenesis is a potential mechanism to explain the observed matter-antimatter asymmetry of the universe. Gravitational tidal effects at the quantum loop level modify the dynamics of the leptons in curved spacetime and may be encoded in a low-energy effective action Seff . It has been shown in previous work how in a high-scale BSM theory the CP odd curvature-induced interactions in Seff modify the dispersion relations of leptons and antileptons differently in an expanding universe, giving rise to an effective chemical potential and a non-vanishing equilibrium lepton-antilepton asymmetry. In this paper, the CP even curvature interactions are shown to break lepton number current conservation and modify the evolution of the lepton number density as the universe expands. These effects are implemented in a generalised Boltzmann equation and used to trace the dynamical evolution of the lepton number density in different cosmological scenarios. The theory predicts a potentially significant gravitationally-induced lepton-antilepton asymmetry at very early times in the evolution of the universe.
published_date 2020-10-05T04:09:42Z
_version_ 1763753677267402752
score 11.013148

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