Leptogenesis and tensor polarisation from a gravitational Chern-Simons term
Manifestación
- Autores
- Identificador
- 873408
- Fecha de publicación
- 2005
- Forma obra
- Texto
- Lugar de producción
- Journal of High Energy Physics; Vol. 3, No. 16, 2005
- Idioma
- inglés
- Nota de edición
- Digitalización realizada por la Biblioteca Virtual del Banco de la República (Colombia)
- Materias
-
- Ciencias naturales y matemáticas; Ciencias naturales y matemáticas / Física
- Notas
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- Colfuturo
- © Derechos reservados del autor
- Cosmología; Física; Teorías clásicas de la gravedad; Teorías de Chern-Simon
- 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.
- Enlace permanente
- https://www.cervantesvirtual.com/obra/leptogenesis-and-tensor-polarisation-from-a-gravitational-chern-simons-term-873408
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