Superluminality in DHOST theory with extra scalar

A bstract We consider DHOST Ia theory interacting gravitationally with an additional conventional scalar field minimally coupled to gravity. At the linearized level of perturbations about cosmological background, we find that in the presence of a slowly rolling extra scalar field, one of the modes g...

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Published inThe journal of high energy physics Vol. 2021; no. 4; pp. 1 - 13
Main Authors Mironov, S., Rubakov, V., Volkova, V.
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer Berlin Heidelberg 01.04.2021
Springer Nature B.V
SpringerOpen
Subjects
Classical and Quantum Gravitation
Classical Theories of Gravity
Effective Field Theories
Elementary Particles
Gravity
High energy physics
Perturbation
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Regular Article - Theoretical Physics
Relativity Theory
Scalars
String Theory
Classical Theories of Gravity
Effective Field Theories
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Summary:A bstract We consider DHOST Ia theory interacting gravitationally with an additional conventional scalar field minimally coupled to gravity. At the linearized level of perturbations about cosmological background, we find that in the presence of a slowly rolling extra scalar field, one of the modes generically propagates at superluminal speed. This result is valid for any stable cosmological background. We identify a subclass of DHOST Ia theories in which this superluminality property is absent, and all modes may propagate (sub)luminally. We discuss possible implications for the interacting DHOST Ia theories.
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP04(2021)035