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Quintessence, Cosmic Coincidence, and the Cosmological Constant
Open accessAbstract
Recent observations suggest that a large fraction of the energy density of the Universe has negative pressure. One explanation is vacuum energy density; another is quintessence in the form of a scalar field slowly evolving down a potential. In either case, a key problem is to explain why the energy density nearly coincides with the matter density today. The densities decrease at different rates as the Universe expands, so coincidence today appears to require that their ratio be set to a specific, infinitesimal value in the early Universe. In this paper, we introduce the notion of a ``tracker field,'' a form of quintessence, and show how it may explain the coincidence, adding new motivation for the quintessence scenario.
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Citations
Cites
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
Cited by
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Three‐Year Wilkinson Microwave Anisotropy Probe ( WMAP ) Observations: Implications for Cosmology
Spergel, D. N., Bean, R., Dore, O., Nolta, M. R., Bennett, C. L., Dunkley, J., Hinshaw, G., Jarosik, N., Komatsu, E., Page, L., et al. (2007) · The Astrophysical Journal Supplement Series · doi:10.1086/513700 · Cited by 6,778
FIVE-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE OBSERVATIONS: COSMOLOGICAL INTERPRETATION
Komatsu, E., Dunkley, J., Nolta, M. R., Bennett, C. L., Gold, B., Hinshaw, G., Jarosik, N., Larson, D., Limon, M., Page, L., et al. (2009) · The Astrophysical Journal Supplement Series · doi:10.1088/0067-0049/180/2/330 · Cited by 5,786
THE CASE FOR A POSITIVE COSMOLOGICAL Λ-TERM
SAHNI, V., & STAROBINSKY, A. (2000) · International Journal of Modern Physics D · doi:10.1142/s0218271800000542 · Cited by 2,767
Carroll, S. M. (2001) · Living Reviews in Relativity · doi:10.12942/lrr-2001-1 · Cited by 2,650
Metadata
- Authors
- Zlatev, I., Wang, L., & Steinhardt, P. J.
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 1999-02-01
- Volume
- 82
- Issue
- 5
- Pages
- 896-899
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W2032901690
- Cited by
- 2,674
- References
- 1
- FWCI
- 82.47
- Type
- journal article
- Language
- en
- Open access
- green
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- Zlatev, I., Wang, L., & Steinhardt, P. J. (1999). Quintessence, Cosmic Coincidence, and the Cosmological Constant. Physical Review Letters. https://doi.org/10.1103/physrevlett.82.896
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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