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Verfasst von:Bettoni, Dario [VerfasserIn]   i
 Zumalacarregui, Miguel [VerfasserIn]   i
Titel:Kinetic mixing in scalar-tensor theories of gravity
Verf.angabe:Dario Bettoni, Miguel Zumalacárregui
E-Jahr:2015
Jahr:11 May 2015
Fussnoten:Gesehen am 22.05.2020
Titel Quelle:Enthalten in: Physical review / D
Ort Quelle:[S.l.] : Soc., 1970
Jahr Quelle:2015
Band/Heft Quelle:91(2015,10) Artikel-Nummer 104009, 19 Seiten
ISSN Quelle:1550-2368
 1089-4918
Abstract: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.
DOI:doi:10.1103/PhysRevD.91.104009
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext ; Verlag: https://doi.org/10.1103/PhysRevD.91.104009
 Volltext: https://link.aps.org/doi/10.1103/PhysRevD.91.104009
 DOI: https://doi.org/10.1103/PhysRevD.91.104009
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1698698046
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