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Leptogenesis and tensor polarisation from a gravitational Chern-Simons term

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arxiv hep-th/0501153 v3 pith:2XCIQGDN submitted 2005-01-19 hep-th hep-ph

Leptogenesis and tensor polarisation from a gravitational Chern-Simons term

David H. Lyth (1) , Carlos Quimbay (2) , Yeinzon Rodriguez (1 , 3) ((1) Department of Physics Lancaster University , (2) Departamento de Fisica Universidad Nacional de Colombia , (3) Centro de Investigaciones Universidad Antonio Narino) This is my paper
classification hep-th hep-ph
keywords termgravitationaltheoryvacuumaxionchern-simonsexpectationfield
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Within an effective field theory derived from string theory, the universal axion has to be coupled to the the gravitational Chern-Simons (gCS) term. During any era when the axion field is varying, the vacuum fluctuation of the gravitational wave amplitude will then be circularly polarised, generating an expectation value for the gCS term. The polarisation may be observable through the Cosmic Microwave Background, and the vacuum expectation value of the gCS term may generate the baryon asymmetry of the Universe. We argue here that such effects cannot be computed without further input from string theory, since the `vacuum' in question is unlikely to be the field-theoretic one.

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