Environmental CPT Violation in an Expanding Universe in String Theory
arXiv:1304.5433 · doi:10.1016/j.physletb.2013.07.016
Abstract
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.
8 pages, some clarifying remarks and references added, correction of typos in the text below eq. (26), no effects on conclusions
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- Implications of axionic hair on shadow of M87*
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- Gravitational leptogenesis, C, CP and strong equivalence
- Quasinormal Modes, Grebody Factors, and Hawking Radiation Sparsity of Black Holes Influenced by a Global Monopole Charge in Kalb-Ramond Gravity
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