The effective theory of quintessence: the w < 1 side unveiled
By P. Creminelli, Guido D'Amico, J. Noreña, F. Vernizzi. 2008
278 citations recorded by the source corpus.
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{sub Q} < -1 or in crossing the phantom divide w{sub Q} = -1. Stability requires that the w{sub 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{sub Q} < -1 or crossing the phantom divide. We summarize the theoretical and stability constraints on the quintessential plane (1+w{sub Q}) vs. speed of sound squared.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/4c6700c9f845b403e217e20e840fcbec32cbb6b3
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Citations in the corpus
- Gravitational wave decay into dark energy (2018, methodology): “At variance with a cosmological constant—the simplest explanation of the present acceleration—models of Dark Energy (and Modified Gravity) act as a sort of “medium”, through which GWs travel.”
- Modified Gravity-GADGET: A new code for cosmological hydrodynamical simulations of modified gravity models (2013, background): “More sophisticated models can be obtained by dropping such assumptions and allowing the DE scalar field to cluster at sub-horizon scales and to have direct interactions with standard particles as for the case of Clustering Dark Energy (Creminelli et al. 2009; Sefusatti & Vernizzi 2011; Batista & Pac”
- Spherical collapse in quintessence models with zero speed of sound (2009, methodology): “The study of quintessence perturbations – where by quintessence we indicate a dark energy sector described by a single scalar degree of freedom – has been recently revived in [4].”
- Effective field theory of cosmological perturbations (2013, methodology): “The extension of this approach to late-time acceleration was developed in [30] for a minimally coupled field and in [31–34] for more general couplings.”
- Approaches to understanding cosmic acceleration (2009, background): “For this, and other reasons, it has proven extremely difficult to construct sensible models for which an equation of state w < −1 is realized within general relativity with minimally coupled sources, although some progress has been made with ghost condensate models [88].”
- Exploring gravitational theories beyond Horndeski (2014, background): “[37, 15, 16, 11, 17] in the case where dark energy can be described by a single scalar degree of freedom.”