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Leptogenesis from loop effects in curved spacetime

Jamie I McDonald, Graham Shore

Journal of High Energy Physics, Volume: 1604, Start page: 030

Swansea University Author: Graham Shore

DOI (Published version): 10.1007/JHEP04(2016)030

Abstract

We describe a new mechanism -- radiatively-induced gravitational leptogenesis -- for generating the matter-antimatter asymmetry of the Universe. We show how quantum loop effects in C and CP violating theories cause matter and antimatter to propagate differently in the presence of gravity, and prove...

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Published in: Journal of High Energy Physics
Published: 2016
Online Access: https://arXiv:1512.02238 [hep-ph]
URI: https://cronfa.swan.ac.uk/Record/cronfa25650
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spelling 2017-05-31T16:23:39.6497006 v2 25650 2016-01-14 Leptogenesis from loop effects in curved spacetime 28a24f55687c82d6f3ee378ead3cf234 Graham Shore Graham Shore true false 2016-01-14 FGSEN We describe a new mechanism -- radiatively-induced gravitational leptogenesis -- for generating the matter-antimatter asymmetry of the Universe. We show how quantum loop effects in C and CP violating theories cause matter and antimatter to propagate differently in the presence of gravity, and prove this is forbidden in flat space by CPT and translation symmetry. This generates a curvature-dependent chemical potential for leptons, allowing a matter-antimatter asymmetry to be generated in thermal equilibrium in the early Universe. The time-dependent dynamics necessary for leptogenesis is provided by the interaction of the virtual self-energy cloud of the leptons with the expanding curved spacetime background, which violates the strong equivalence principle and allows a distinction between matter and antimatter. We show here how this mechanism is realised in a particular BSM theory, the see-saw model, where the quantum loops involve the heavy sterile neutrinos responsible for light neutrino masses. We demonstrate by explicit computation of the relevant two-loop Feynman diagrams how the size of the radiative corrections relevant for leptogenesis becomes enhanced by increasing the mass hierarchy of the sterile neutrinos, and show that for realistic phenomenological parameters this mechanism can generate the observed baryon-to-photon ratio of the Universe. Journal Article Journal of High Energy Physics 1604 030 7 3 2016 2016-03-07 10.1007/JHEP04(2016)030 https://arXiv:1512.02238 [hep-ph] JHEP is an open-access journal funded by SCOAP3 and licensed under CC BY 4.0 COLLEGE NANME Science and Engineering - Faculty COLLEGE CODE FGSEN Swansea University SCOAP 2017-05-31T16:23:39.6497006 2016-01-14T07:44:19.7510751 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Jamie I McDonald 1 Graham Shore 2 0025650-20022016164109.pdf RIS-JHEP04(2016)030.pdf 2016-02-20T16:41:09.2330000 Output 703112 application/pdf Accepted Manuscript true 2016-05-14T00:00:00.0000000 true
title Leptogenesis from loop effects in curved spacetime
spellingShingle Leptogenesis from loop effects in curved spacetime
Graham Shore
title_short Leptogenesis from loop effects in curved spacetime
title_full Leptogenesis from loop effects in curved spacetime
title_fullStr Leptogenesis from loop effects in curved spacetime
title_full_unstemmed Leptogenesis from loop effects in curved spacetime
title_sort Leptogenesis from loop effects in curved spacetime
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 1604
container_start_page 030
publishDate 2016
institution Swansea University
doi_str_mv 10.1007/JHEP04(2016)030
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
url https://arXiv:1512.02238 [hep-ph]
document_store_str 1
active_str 0
description We describe a new mechanism -- radiatively-induced gravitational leptogenesis -- for generating the matter-antimatter asymmetry of the Universe. We show how quantum loop effects in C and CP violating theories cause matter and antimatter to propagate differently in the presence of gravity, and prove this is forbidden in flat space by CPT and translation symmetry. This generates a curvature-dependent chemical potential for leptons, allowing a matter-antimatter asymmetry to be generated in thermal equilibrium in the early Universe. The time-dependent dynamics necessary for leptogenesis is provided by the interaction of the virtual self-energy cloud of the leptons with the expanding curved spacetime background, which violates the strong equivalence principle and allows a distinction between matter and antimatter. We show here how this mechanism is realised in a particular BSM theory, the see-saw model, where the quantum loops involve the heavy sterile neutrinos responsible for light neutrino masses. We demonstrate by explicit computation of the relevant two-loop Feynman diagrams how the size of the radiative corrections relevant for leptogenesis becomes enhanced by increasing the mass hierarchy of the sterile neutrinos, and show that for realistic phenomenological parameters this mechanism can generate the observed baryon-to-photon ratio of the Universe.
published_date 2016-03-07T03:30:40Z
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score 11.013148

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