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 $(\delta g_{(u)}^{00}{)}^n$ 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 $K^{\prime }$ 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.

36 pages, 8 figures

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Cited by in corpus (16)

• Testing General Relativity in Cosmology
• Effective Field Theory of Dark Energy: a Review
• Testing Screened Modified Gravity
• Effective Theory of Dark Energy at Redshift Survey Scales
• Nonlinear Effective Theory of Dark Energy
• Constraints on modified gravity from the BOSS galaxy survey
• K-mouflage Imprints on Cosmological Observables and Data Constraints
• Probing Modified Gravity with Integrated Sachs-Wolfe CMB and Galaxy Cross-correlations
• Euclid: Constraining linearly scale-independent modifications of gravity with the spectroscopic and photometric primary probes
• Cosmological Tests of Gravity: A Future Perspective
• Holographic RG flows and boundary conditions in a 3D gauged supergravity
• Explaining JWST star formation history at $z\sim 17$ by modifying $\Lambda$CDM
• Screening Mechanisms on White Dwarfs: Symmetron & Dilaton
• K-mouflage at high $k$: extending the reach of $\text{Hi-COLA}$
• Neutron Stars in Causal Scalar-Tensor Theories
• Structural Implications of the Chameleon Mechanism on White Dwarfs