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The state of the dark energy equation of state
Open accessAbstract
By combining data from seven cosmic microwave background experiments (including the latest WMAP results) with the Hubble parameter measurement from the Hubble space telescope and luminosity measurements of type Ia supernovae, we demonstrate the bounds on the dark energy equation of state ${w}_{Q}$ to be $\ensuremath{-}1.45<{w}_{Q}<\ensuremath{-}0.74$ at the 95% confidence level. Although our limit on ${w}_{Q}$ is improved with respect to previous analyses, cosmological data do not rule out the possibility that the equation of state parameter ${w}_{Q}$ of the dark energy Q is less than $\ensuremath{-}1.$ We present a tracking model that ensures ${w}_{Q}<~\ensuremath{-}1$ at recent times and discuss the observational consequences.
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Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
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Cosmological consequences of a rolling homogeneous scalar field
Ratra, B., & Peebles, P. J. E. (1988) · Physical Review D · doi:10.1103/physrevd.37.3406 · Cited by 4,310
Cosmological parameters from CMB and other data: A Monte Carlo approach
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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
Self-citationExtended theories of gravity and their cosmological and astrophysical applications
Capozziello, S., & Francaviglia, M. (2008) · General Relativity and Gravitation · doi:10.1007/s10714-007-0551-y · Cited by 874
SAHNI, V., & STAROBINSKY, A. (2006) · International Journal of Modern Physics D · doi:10.1142/s0218271806009704 · Cited by 734
The phantom menaced: Constraints on low-energy effective ghosts
Cline, J. M., Jeon, S., & Moore, G. D. (2004) · Physical Review D · doi:10.1103/physrevd.70.043543 · Cited by 677
Cosmology of generalized modified gravity models
Carroll, S. M., De Felice, A., Duvvuri, V., Easson, D. A., Trodden, M., & Turner, M. S. (2005) · Physical Review D · doi:10.1103/physrevd.71.063513 · Cited by 604
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Metadata
- Authors
- Melchiorri, A., Mersini, L., Ödman, C. J., & Trodden, M.
- Venue
- Physical Review D
- Publisher
- American Physical Society (APS)
- Published
- 2003-08-12
- Volume
- 68
- Issue
- 4
- ISSN
- 0556-2821 (ISSN-L)
- 1089-4918
- OpenAlex
- W2075588446
- Cited by
- 458
- References
- 6
- FWCI
- 37.69
- Type
- journal article
- Language
- en
- Open access
- green
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