Skip to Main content Skip to Navigation
Preprints, Working Papers, ...

Dark Energy and Modified Gravity in the Effective Field Theory of Large-Scale Structure

Abstract : We develop an approach to compute observables beyond the linear regime of dark matter perturbations for general dark energy and modified gravity models. We do so by combining the Effective Field Theory of Dark Energy and Effective Field Theory of Large-Scale Structure approaches. In particular, we parametrize the linear and nonlinear effects of dark energy on dark matter clustering in terms of the Lagrangian terms introduced in a companion paper [1], focusing on Horndeski theories and assuming the quasi-static approximation. The Euler equation for dark matter is sourced, via the Newtonian potential, by new nonlinear vertices due to modified gravity and, as in the pure dark matter case, by the effects of short-scale physics in the form of the divergence of an effective stress tensor. The effective fluid introduces a counterterm in the solution to the matter continuity and Euler equations, which allows a controlled expansion of clustering statistics on mildly nonlinear scales. We use this setup to compute the one-loop dark-matter power spectrum.
Document type :
Preprints, Working Papers, ...
Complete list of metadatas

Cited literature [79 references]  Display  Hide  Download
Contributor : Emmanuelle de Laborderie <>
Submitted on : Wednesday, January 31, 2018 - 3:32:53 PM
Last modification on : Monday, February 10, 2020 - 6:13:40 PM
Document(s) archivé(s) le : Friday, May 25, 2018 - 5:47:13 PM


Files produced by the author(s)


  • HAL Id : cea-01697830, version 1
  • ARXIV : 1712.02783


Giulia Cusin, Matthew Lewandowski, Filippo Vernizzi. Dark Energy and Modified Gravity in the Effective Field Theory of Large-Scale Structure. 2018. ⟨cea-01697830⟩



Record views


Files downloads