The effective theory of quintessence: thew< −1 side unveiled

2008/11/30 by Paolo Creminelli, Guido D'Amico, Jorge Noreña +1 · 19 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Galaxies: Formation, Evolution, Phenomena #astro-ph #gr-qc #hep-ph #hep-th

paper · pdf · doi:10.1088/1475-7516/2009/02/018

published as JCAP 0902:018,2009 · 35 pages, 5 figures, v3: minor modifications, JCAP published version

openalex publication_date 2009/02/13 · arxiv created 2009/02/16 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30

Abstract

We study generic single-field dark energy models, by a parametrization of the most general theory of their perturbations around a given background, including higher derivative terms. In appropriate limits this approach reproduces standard quintessence, k -essence and ghost condensation. We find no general pathology associated to an equation of state w Q < −1 or in crossing the phantom divide w Q = −1. Stability requires that the w Q < −1 side of dark energy behaves, on cosmological scales, as a k -essence fluid with a virtually zero speed of sound. This implies that one should set the speed of sound to zero when comparing with data models with w Q < −1 or crossing the phantom divide. We summarize the theoretical and stability constraints on the quintessential plane (1+ w Q ) vs. speed of sound squared.

Citations

• Constraining dark energy with cross-correlated CMB and large scale structure data
• A Measure of de Sitter Entropy and Eternal Inflation
• Causality, Analyticity and an IR Obstruction to UV Completion
• Higher-derivative Lagrangians, nonlocality, problems, and solutions
• k-Inflation

Cited by

• Clustering dark energy and halo abundances
• Exact solutions of nonlocal nonlinear field equations in cosmology
• Testing General Relativity in Cosmology
• Impact of dark energy perturbations on the growth index
• Nonlinear effects of dark energy clustering beyond the acoustic scales
• Disformal invariance of cosmological perturbations in a generalized class of Horndeski theories
• Effective field theory of coupled dark energy and dark matter
• Dark energy homogeneity in general relativity: Are we applying it correctly?
• Constraining modified theories of gravity with the galaxy bispectrum
• Baryonic effects in the Effective Field Theory of Large-Scale Structure and an analytic recipe for lensing in CMB-S4
• Strongly coupled quintessence
• The effective field theory of vector-tensor theories
• Ghost condensate and generalized second law
• Stability of geodesically complete cosmologies
• Inhomogeneous and Interacting Vacuum Energy
• Updated observational constraints on quintessence dark energy models
• IR-safe and UV-safe integrands in the EFTofLSS with exact time dependence
• Phenomenology of dark energy: general features of large-scale perturbations
• Slow-roll freezing quintessence

Related

• Quintessence: A Review
• Quintessence: an analytical study, with theoretical and observational applications
• The quintessence field as a perfect cosmic fluid of constant pressure
• Quintessence
• Kinetic k-essence and quintessence