Shaken, not stirred: Kinetic mixing in scalar-tensor theories of gravity

[EN] Kinetic mixing between the metric and scalar degrees of freedom is an essential ingredient in contemporary scalar-tensor theories. This often makes it hard to understand their physical content, especially when derivative mixing is present, as is the case for Horndeski action. In this work we de...

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Detalles Bibliográficos
Autores: Bettoni, Dario (1983-), Zumalacárregui, Miguel
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2015
País:España
Institución:Universidad Rey Juan Carlos
Repositorio:BULERIA. Repositorio Institucional de la Universidad de León
OAI Identifier:oai:buleria.unileon.es:10612/19557
Acceso en línea:https://hdl.handle.net/10612/19557
Access Level:acceso abierto
Palabra clave:Física
Teorías escalar-tensoriales
Cosmología
Física Teórica
2101 Cosmología y Cosmogonía
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spelling Shaken, not stirred: Kinetic mixing in scalar-tensor theories of gravityBettoni, Dario (1983-)Zumalacárregui, MiguelFísicaTeorías escalar-tensorialesCosmologíaFísica Teórica2101 Cosmología y Cosmogonía[EN] Kinetic mixing between the metric and scalar degrees of freedom is an essential ingredient in contemporary scalar-tensor theories. This often makes it hard to understand their physical content, especially when derivative mixing is present, as is the case for Horndeski action. In this work we develop a method that allows us to write a Ricci-curvature-free scalar field equation, and we discuss some of the advantages of such a rephrasing in the study of stability issues in the presence of matter, the existence of an Einstein frame, and the generalization of the disformal screening mechanism. For quartic Horndeski theories, such a procedure leaves, in general, a residual coupling to the curvature, given by the Weyl tensor. This gives rise to a binary classification of scalar-tensor theories into stirred theories, in which the curvature can be substituted, and shaken theories, in which a residual coupling to the curvature remains. Quite remarkably, we have found that generalized Dirac-Born-Infeld Galileons belong to the first class. Finally, we discuss kinetic mixing in quintic theories, in which nonlinear mixing terms appear, and in the recently proposed theories beyond Horndeski that display a novel form of kinetic mixing, in which the field equation is sourced by derivatives of the energy-momentum tensor.SIAmerican Physical SocietyDidactica de la MatematicaEscuela de Ingenierias Industrial, Informática y Aeroespacial2015info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionhttps://hdl.handle.net/10612/19557reponame:BULERIA. Repositorio Institucional de la Universidad de Leóninstname:Universidad Rey Juan CarlosInglésinfo:eu-repo/semantics/openAccessoai:buleria.unileon.es:10612/195572026-06-24T12:43:27Z
dc.title.none.fl_str_mv Shaken, not stirred: Kinetic mixing in scalar-tensor theories of gravity
title Shaken, not stirred: Kinetic mixing in scalar-tensor theories of gravity
spellingShingle Shaken, not stirred: Kinetic mixing in scalar-tensor theories of gravity
Bettoni, Dario (1983-)
Física
Teorías escalar-tensoriales
Cosmología
Física Teórica
2101 Cosmología y Cosmogonía
title_short Shaken, not stirred: Kinetic mixing in scalar-tensor theories of gravity
title_full Shaken, not stirred: Kinetic mixing in scalar-tensor theories of gravity
title_fullStr Shaken, not stirred: Kinetic mixing in scalar-tensor theories of gravity
title_full_unstemmed Shaken, not stirred: Kinetic mixing in scalar-tensor theories of gravity
title_sort Shaken, not stirred: Kinetic mixing in scalar-tensor theories of gravity
dc.creator.none.fl_str_mv Bettoni, Dario (1983-)
Zumalacárregui, Miguel
author Bettoni, Dario (1983-)
author_facet Bettoni, Dario (1983-)
Zumalacárregui, Miguel
author_role author
author2 Zumalacárregui, Miguel
author2_role author
dc.contributor.none.fl_str_mv Didactica de la Matematica
Escuela de Ingenierias Industrial, Informática y Aeroespacial
dc.subject.none.fl_str_mv Física
Teorías escalar-tensoriales
Cosmología
Física Teórica
2101 Cosmología y Cosmogonía
topic Física
Teorías escalar-tensoriales
Cosmología
Física Teórica
2101 Cosmología y Cosmogonía
description [EN] Kinetic mixing between the metric and scalar degrees of freedom is an essential ingredient in contemporary scalar-tensor theories. This often makes it hard to understand their physical content, especially when derivative mixing is present, as is the case for Horndeski action. In this work we develop a method that allows us to write a Ricci-curvature-free scalar field equation, and we discuss some of the advantages of such a rephrasing in the study of stability issues in the presence of matter, the existence of an Einstein frame, and the generalization of the disformal screening mechanism. For quartic Horndeski theories, such a procedure leaves, in general, a residual coupling to the curvature, given by the Weyl tensor. This gives rise to a binary classification of scalar-tensor theories into stirred theories, in which the curvature can be substituted, and shaken theories, in which a residual coupling to the curvature remains. Quite remarkably, we have found that generalized Dirac-Born-Infeld Galileons belong to the first class. Finally, we discuss kinetic mixing in quintic theories, in which nonlinear mixing terms appear, and in the recently proposed theories beyond Horndeski that display a novel form of kinetic mixing, in which the field equation is sourced by derivatives of the energy-momentum tensor.
publishDate 2015
dc.date.none.fl_str_mv 2015
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/10612/19557
url https://hdl.handle.net/10612/19557
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv American Physical Society
publisher.none.fl_str_mv American Physical Society
dc.source.none.fl_str_mv reponame:BULERIA. Repositorio Institucional de la Universidad de León
instname:Universidad Rey Juan Carlos
instname_str Universidad Rey Juan Carlos
reponame_str BULERIA. Repositorio Institucional de la Universidad de León
collection BULERIA. Repositorio Institucional de la Universidad de León
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300719

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