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The effective field theory of K-mouflage

Abstract : We describe K-mouflage models of modified gravity using the effective field theory of dark energy. We show how the Lagrangian density $K$ defining the K-mouflage models appears in the effective field theory framework, at both the exact fully nonlinear level and at the quadratic order of the effective action. We find that K-mouflage scenarios only generate the operator $(\delta g^{00}_{(u)})^n$ at each order $n$. We also reverse engineer K-mouflage models by reconstructing the whole effective field theory, and the full cosmological behaviour, from two functions of the Jordan-frame scale factor in a tomographic manner. This parameterisation is directly related to the implementation of the K-mouflage screening mechanism: screening occurs when $ K'$ is large in a dense environment such as the deep matter and radiation eras. In this way, K-mouflage can be easily implemented as a calculable subclass of models described by the effective field theory of dark energy which could be probed by future surveys.
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Contributor : Emmanuelle de Laborderie <>
Submitted on : Thursday, September 17, 2015 - 3:23:07 PM
Last modification on : Monday, February 10, 2020 - 6:13:39 PM

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  • HAL Id : cea-01201562, version 1
  • ARXIV : 1509.00611



Philippe Brax, Patrick Valageas. The effective field theory of K-mouflage. 2015. ⟨cea-01201562⟩



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