Compartir
Título
Disformal invariance of second order scalar-tensor theories: Framing the Horndeski action
Autor
Facultad/Centro
Área de conocimiento
Título de la revista
Physical Review D
Número de la revista
8
Cita Bibliográfica
Bettoni, D., & Liberati, S. (2013). Disformal invariance of second order scalar-tensor theories: Framing the Horndeski action. Physical Review D, 88(8), 084020.
Editorial
American Physical Society
Fecha
2013-10-14
ISSN
1550-7998
Resumen
[EN] The Horndeski action is the most general one involving a metric and a scalar field that leads to second-order field equations in four dimensions. Being the natural extension of the well-known scalar-tensor theories, its structure and properties are worth analyzing along the experience accumulated in the latter context. Here, we argue that disformal transformations play, for the Horndeski theory, a similar role to that of conformal transformations for scalar-tensor theories a là Brans–Dicke. We identify the most general transformation preserving second-order field equations and discuss the issue of viable frames for this kind of theory, in particular, the possibility to cast the action in the so-called Einstein frame. Interestingly, we find that only for a subset of the Horndeski Lagrangian such a frame exists. Finally, we investigate the transformation properties of such frames under field redefinitions and frame transformations and their reciprocal relationship.
Materia
Palabras clave
Peer review
SI
URI
DOI
Aparece en las colecciones
- Artículos [5086]
Ficheros en el ítem
Tamaño:
288.3
xmlui.dri2xhtml.METS-1.0.size-kilobytes
Formato:
Adobe PDF