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Gravitational Leptogenesis in Bounce Cosmology

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Title
Gravitational Leptogenesis in Bounce Cosmology
Author(s)
Neil D. Barrie
Publication Date
2021-06
Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, no.6
Publisher
IOP PUBLISHING LTD
Abstract
We investigate whether successful Gravitational Leptogenesis can take place during an Ekpyrotic contraction phase. Two possible paths by which this can occur are coupling the Ekpyrotic scalar to a gravitational Chern-Simons term, or to a U(1) gauge field ChernSimons term. These couplings lead to the production of chiral gravitational waves, which generate a lepton number asymmetry through the gravitational-lepton number anomaly. This lepton asymmetry is subsequently reprocessed by equilibrium sphaleron processes to produce a baryon asymmetry. We find successful Gravitational Leptogenesis to be possible in Ekpyrotic bounce cosmologies through both of these mechanisms.
URI
https://pr.ibs.re.kr/handle/8788114/10049
DOI
10.1088/1475-7516/2021/06/049
ISSN
1475-7516
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > 1. Journal Papers (저널논문)
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