Leptogenesis and tensor polarisation from a gravitational Chern-Simons term

CONTENIDO DE LIBRE ACCESO

Este contenido es de libre acceso. Solo haz clic en el siguiente botón.

Descripción: 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.
Citación recomendada (normas APA)
: Yeinzon; Lyth Rodríguez García, "Leptogenesis and tensor polarisation from a gravitational Chern-Simons term", -:Journal of High Energy Physics; Vol. 3, No. 16, 2005. Consultado en línea en la Biblioteca Digital de Bogotá (https://www.bibliotecadigitaldebogota.gov.co/resources/2084664/), el día 2025-05-12.

Información adicional