Leptogenesis and gravity: Baryon asymmetry without decays
A popular class of theories attributes the matter-antimatter asymmetry of the Universe to CP-violating decays of super-heavy BSM particles in the Early Universe. Recently, we discovered a new source of leptogenesis in these models, namely that the same Yukawa phases which provide the CP violation fo...
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Format: | Article |
Language: | English |
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Elsevier
2017-03-01
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Series: | Physics Letters B |
Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269316307316 |
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author | J.I. McDonald G.M. Shore |
author_facet | J.I. McDonald G.M. Shore |
author_sort | J.I. McDonald |
collection | DOAJ |
description | A popular class of theories attributes the matter-antimatter asymmetry of the Universe to CP-violating decays of super-heavy BSM particles in the Early Universe. Recently, we discovered a new source of leptogenesis in these models, namely that the same Yukawa phases which provide the CP violation for decays, combined with curved-spacetime loop effects, lead to an entirely new gravitational mechanism for generating an asymmetry, driven by the expansion of the Universe and independent of the departure of the heavy particles from equilibrium. In this Letter, we build on previous work by analysing the full Boltzmann equation, exploring the full parameter space of the theory and studying the time-evolution of the asymmetry. Remarkably, we find regions of parameter space where decays play no part at all, and where the baryon asymmetry of the Universe is determined solely by gravitational effects. |
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id | doaj.art-0c8ec49b02c14874b63891e5dd0bebc9 |
institution | Directory Open Access Journal |
issn | 0370-2693 1873-2445 |
language | English |
last_indexed | 2024-12-13T04:44:11Z |
publishDate | 2017-03-01 |
publisher | Elsevier |
record_format | Article |
series | Physics Letters B |
spelling | doaj.art-0c8ec49b02c14874b63891e5dd0bebc92022-12-21T23:59:13ZengElsevierPhysics Letters B0370-26931873-24452017-03-01766C16216910.1016/j.physletb.2016.11.057Leptogenesis and gravity: Baryon asymmetry without decaysJ.I. McDonaldG.M. ShoreA popular class of theories attributes the matter-antimatter asymmetry of the Universe to CP-violating decays of super-heavy BSM particles in the Early Universe. Recently, we discovered a new source of leptogenesis in these models, namely that the same Yukawa phases which provide the CP violation for decays, combined with curved-spacetime loop effects, lead to an entirely new gravitational mechanism for generating an asymmetry, driven by the expansion of the Universe and independent of the departure of the heavy particles from equilibrium. In this Letter, we build on previous work by analysing the full Boltzmann equation, exploring the full parameter space of the theory and studying the time-evolution of the asymmetry. Remarkably, we find regions of parameter space where decays play no part at all, and where the baryon asymmetry of the Universe is determined solely by gravitational effects.http://www.sciencedirect.com/science/article/pii/S0370269316307316 |
spellingShingle | J.I. McDonald G.M. Shore Leptogenesis and gravity: Baryon asymmetry without decays Physics Letters B |
title | Leptogenesis and gravity: Baryon asymmetry without decays |
title_full | Leptogenesis and gravity: Baryon asymmetry without decays |
title_fullStr | Leptogenesis and gravity: Baryon asymmetry without decays |
title_full_unstemmed | Leptogenesis and gravity: Baryon asymmetry without decays |
title_short | Leptogenesis and gravity: Baryon asymmetry without decays |
title_sort | leptogenesis and gravity baryon asymmetry without decays |
url | http://www.sciencedirect.com/science/article/pii/S0370269316307316 |
work_keys_str_mv | AT jimcdonald leptogenesisandgravitybaryonasymmetrywithoutdecays AT gmshore leptogenesisandgravitybaryonasymmetrywithoutdecays |