String theory backgrounds with torsion in the presence of fermions and implications for leptogenesis

Sarben Sarkar

doi:10.1088/1742-6596/631/1/012089

String theory backgrounds with torsion in the presence of fermions and implications for leptogenesis

Sarben Sarkar^*

^*Corresponding author for this work

King's College London

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

161 Downloads (Pure)

Abstract

Fermions couple in a universal way to the the Kalb-Ramond field which occurs in the gravitational multiplet of string theory. The Kalb-Ramond field is a source of torsion and can provide a background for fermion dynamics. Solutions for this background in terms of the string effective action are discussed and are fixed "points" of conformal invariance conditions. Non- perturbative fixed points for the torsion in the absence of matter are shown to be compatible with perturbative fixed points in the presence of matter. Fermion coupling to such backgrounds can lead to both CP and CPT violation. Hence torsion can give a new mechanism for leptogenesis. The presence of anomalies in the Bianchi identity for the torsion, in the presence of matter, is crucial in giving a background solution for the torsion and dilaton with an acceptable cosmology.

Original language	English
Article number	012089
Number of pages	9
Journal	Journal of Physics: Conference Series
Volume	631
Issue number	1
DOIs	https://doi.org/10.1088/1742-6596/631/1/012089
Publication status	Published - 30 Jul 2015

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10.1088/1742-6596/631/1/012089Licence: CC BY

String Theory Backgrounds with_SARKAR_Accepted 24Jun2015_GOLD VoRFinal published version, 844 KBLicence: CC BY

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String theory backgrounds with torsion in the presence of fermions and implications for leptogenesis

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