Spontaneous CPT Violation and Quantum Anomalies in a Model for Matter-Antimatter Asymmetry in the Cosmos

被引：18

作者：

Mavromatos, Nick E. ^{[1
]}

Sarkar, Sarben ^{[1
]}

机构：

[1] Kings Coll London, Dept Phys, Theoret Particle Phys & Cosmol Grp, London WC2R 2LS, England

来源：

UNIVERSE | 2019年 / 5卷 / 01期

关键词：

leptogenesis; CPT violation; string effective theories; EXPANDING UNIVERSE; LEPTOGENESIS; BARYOGENESIS; AMBIGUITIES; INVARIANCE; PROGRESS; DILATON;

D O I：

10.3390/universe5010005

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We review scenarios of baryogenesis through leptogenesis at early epochs of the universe, in string-inspired minimal extensions of the Standard Model (SM), involving heavy right-handed Majorana neutrinos. Spontaneous violation of CPT symmetry is induced by appropriate (in general, temperature-dependent) backgrounds of the Kalb-Ramond (KR) axion field, which has its origins in the (bosonic) massless string multiplet. As interesting features of the model, we also discuss two issues associated with quantum (chiral) anomalies: (i) the non-contribution of the KR axion background to the (anomalous) chiral magnetic effect, which arises in the presence of external electromagnetic fields and non-zero chiral chemical potentials of charged fermions; and (ii) the potential role of quantum fluctuations of the KR axion on the (anomalous) radiative generation of a Majorana mass for the right-handed neutrinos themselves.

引用

页数：22

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