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Measuring the equation of state of the universe: Pitfalls and prospects
Open accessAbstract
We explore various pitfalls and challenges in determining the equation of state $(w)$ of the dark energy component that dominates the universe and causes the current accelerated expansion. We demonstrated in an earlier paper the existence of a degeneracy that makes it impossible to resolve well the value of w or its time derivative with supernovae data. Here we consider standard practices, such as assuming that w is constant or greater than $\ensuremath{-}1,$ and show that they also can lead to gross errors in estimating the true equation of state. We further consider combining measurements of the cosmic microwave background anisotropy and the Alcock-Paczynski test with supernovae data and find that the improvement in resolving the time derivative of w is marginal, although the combination can constrain its present value perhaps to 20% uncertainty.
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Cites
Measurements of Ω and Λ from 42 High‐Redshift Supernovae
Perlmutter, S., Aldering, G., Goldhaber, G., Knop, R. A., Nugent, P., Castro, P. G., Deustua, S., Fabbro, S., Goobar, A., Groom, D. E., et al. (1999) · The Astrophysical Journal · doi:10.1086/307221 · Cited by 18,062
Cited by
Eisenstein, D. J., Zehavi, I., Hogg, D. W., Scoccimarro, R., Blanton, M. R., Nichol, R. C., Scranton, R., Seo, H., Tegmark, M., Zheng, Z., et al. (2005) · The Astrophysical Journal · doi:10.1086/466512 · Cited by 4,629
Can the dark energy equation-of-state parameter w be less than−1?
Carroll, S. M., Hoffman, M., & Trodden, M. (2003) · Physical Review D · doi:10.1103/physrevd.68.023509 · Cited by 1,251
SAHNI, V., & STAROBINSKY, A. (2006) · International Journal of Modern Physics D · doi:10.1142/s0218271806009704 · Cited by 734
Two new diagnostics of dark energy
Sahni, V., Shafieloo, A., & Starobinsky, A. A. (2008) · Physical Review D · doi:10.1103/physrevd.78.103502 · Cited by 709
Cosmological dynamics of a phantom field
Singh, P., Sami, M., & Dadhich, N. (2003) · Physical Review D · doi:10.1103/physrevd.68.023522 · Cited by 516
Is there supernova evidence for dark energy metamorphosis?
Alam, U., Sahni, V., Deep Saini, T., & Starobinsky, A. A. (2004) · Monthly Notices of the Royal Astronomical Society · doi:10.1111/j.1365-2966.2004.08189.x · Cited by 484
The state of the dark energy equation of state
Melchiorri, A., Mersini, L., Ödman, C. J., & Trodden, M. (2003) · Physical Review D · doi:10.1103/physrevd.68.043509 · Cited by 458
Large-scale cosmic microwave background anisotropies and dark energy
Weller, J., & Lewis, A. M. (2003) · Monthly Notices of the Royal Astronomical Society · doi:10.1111/j.1365-2966.2003.07144.x · Cited by 253
Metadata
- Authors
- Maor, I., Brustein, R., McMahon, J., & Steinhardt, P. J.
- Venue
- Physical Review D
- Publisher
- American Physical Society (APS)
- Published
- 2002-05-31
- Volume
- 65
- Issue
- 12
- ISSN
- 0556-2821 (ISSN-L)
- 1089-4918
- OpenAlex
- W2108068011
- Cited by
- 203
- References
- 1
- FWCI
- 20.31
- Type
- journal article
- Language
- en
- Open access
- green
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