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The effective theory of quintessence: the w< −1 side unveiled
Open accessAbstract
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.
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Armendáriz-Picón, C., Damour, T., & Mukhanov, V. (1999) · Physics Letters B · doi:10.1016/s0370-2693(99)00603-6 · Cited by 1,846
A measure of de Sitter entropy and eternal inflation
Arkani-Hamed, N., Dubovsky, S., Nicolis, A., Trincherini, E., & Villadoro, G. (2007) · Journal of High Energy Physics · doi:10.1088/1126-6708/2007/05/055 · Cited by 161
Can a galaxy redshift survey measure dark energy clustering?
Takada, M. (2006) · Physical Review D · doi:10.1103/physrevd.74.043505 · Cited by 59
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Beyond the cosmological standard model
Joyce, A., Jain, B., Khoury, J., & Trodden, M. (2015) · Physics Reports · doi:10.1016/j.physrep.2014.12.002 · Cited by 1,231
Cosmology and Fundamental Physics with the Euclid Satellite
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Self-citationImperfect dark energy from kinetic gravity braiding
Deffayet, C., Pujolàs, O., Sawicki, I., & Vikman, A. (2010) · Journal of Cosmology and Astroparticle Physics · doi:10.1088/1475-7516/2010/10/026 · Cited by 704
Metadata
- Authors
- Creminelli, P., D'Amico, G., Noreña, J., & Vernizzi, F.
- Venue
- Journal of Cosmology and Astroparticle Physics
- Publisher
- IOP Publishing
- Published
- 2009-02-13
- Volume
- 2009
- Issue
- 02
- Pages
- 018-018
- ISSN
- 1475-7508 (ISSN-L)
- 1475-7516
- OpenAlex
- W2094446423
- Cited by
- 250
- References
- 3
- FWCI
- 6.17
- Type
- journal article
- Language
- en
- Open access
- bronze
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