Fab Four effective field theory treatment

Latosh, B.  (Aff1, 0000 0004 1936 7590, grid.12082.39, Department of Physics and Astronomy, University of Sussex, Brighton, BN1 9QH, UK) (Aff2, grid.440621.5, Dubna State University, Universitetskaya str. 19, 141982, Dubna, Russia)

03 December 2018

Abstract: The article addresses the John interaction from Fab Four class of Horndeski models from the effective field theory point of view. Models with this interaction are heavily constrained by gravitational wave speed observations, so it is important to understand, if these constraints hold in the effective field theory framework. We show that John interaction induces new terms quadratic in curvature at the level of the effective (classical) action. These new terms generate additional low energy scalar and spin-2 gravitational degrees of freedom. Some of them have a non-vanishing decay width and some are ghosts. Discussion of these features is given.

Published in: EPJC 78 (2018) 991
Published by: Springer/Società Italiana di Fisica
DOI: 10.1140/epjc/s10052-018-6470-0
License: CC-BY-3.0

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