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Environmental CPT Violation in an Expanding Universe in String Theory

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)407-411
JournalPhysics Letters B
Issue number4-5
Publication statusPublished - 1 Oct 2013

Bibliographical note

8 pages, some clarifying remarks and references added,no effects on conclusions


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King's Authors


We consider a model of an expanding Universe in string theory that yields `environmental' CPT violation for fermions, in the sense of different dispersion relations for fermions and antifermions. These are induced by a cosmological background with constant torsion provided by the Kalb-Ramond antisymmetric tensor field (axion) of the string gravitational multiplet. This effect induces different densities of neutrinos and antineutrinos while in chemical equilibrium, offering new scenarios for leptogenesis and baryogenesis even in the absence of CP violation.

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