On perturbations in Horndeski theories
Institute for Nuclear Research of the Russian Academy of Sciences, 60th October Anniversary Prospect, 7a, 117312 Moscow, Russia
2 Department of Particle Physics and Cosmology, Physics Faculty, M.V. Lomonosov Moscow State University, Vorobjevy Gory, 119991 Moscow, Russia
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Published online: 3 August 2018
This research has been carried out in collaboration with R. Kolevatov, S. Mironov, V. Rubakov and N. Sukhov. We study the approach suggested by Deffayet et al. for obtaining a derivative part of the quadratic action for scalar perturbations in the cubic Horndeski theory. We analyse the validity of the approach and generalize it for the complete Horndeski theory. We explicitly check that the generalized method gives the correct result.
© The Authors, published by EDP Sciences 2018
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