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Crossing the phantom divide barrier with scalar tensor theories
Open accessAbstract
There is accumulating observational evidence (based on SnIa data) that the dark energy equation of state parameter w may be evolving with time and crossing the phantom divide barrier w = −1 at recent times. The confirmation of these indications by future data would indicate that minimally coupled quintessence cannot reproduce the observed expansion rate H ( z ) for any scalar field potential. Here we explicitly demonstrate that scalar tensor theories of gravity (extended quintessence) can predict crossing of the phantom divide barrier. We reconstruct phenomenologically viable scalar–tensor potentials F (Φ) and U (Φ) that can reproduce a polynomial best fit expansion rate H ( z ) and the corresponding dark energy equation of state parameter w ( z ) crossing the w = −1 line. The form of the reconstructed scalar tensor potentials is severely constrained but is not uniquely determined. This is due to observational uncertainties in the form of H ( z ) and also because a single observed function H ( z ) does not suffice for the reconstruction of the two potential functions F (Φ) and U (Φ).
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Cites
Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
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Measurements of Ω and Λ from 42 High‐Redshift Supernovae
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Spergel, D. N., Verde, L., Peiris, H. V., Komatsu, E., Nolta, M. R., Bennett, C. L., Halpern, M., Hinshaw, G., Jarosik, N., Kogut, A., et al. (2003) · The Astrophysical Journal Supplement Series · doi:10.1086/377226 · Cited by 10,976
Riess, A. G., Strolger, L., Tonry, J., Casertano, S., Ferguson, H. C., Mobasher, B., Challis, P., Filippenko, A. V., Jha, S., Li, W., et al. (2004) · The Astrophysical Journal · doi:10.1086/383612 · Cited by 4,315
Cosmological consequences of a rolling homogeneous scalar field
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Exploring the Expansion History of the Universe
Linder, E. V. (2003) · Physical Review Letters · doi:10.1103/physrevlett.90.091301 · Cited by 2,526
Exponential potentials and cosmological scaling solutions
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Cosmological scaling solutions of nonminimally coupled scalar fields
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Cited by
Modified gravity theories on a nutshell: Inflation, bounce and late-time evolution
Nojiri, S., Odintsov, S. D., & Oikonomou, V. K. (2017) · Physics Reports · doi:10.1016/j.physrep.2017.06.001 · Cited by 2,734
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The acceleration of the universe and the physics behind it
Uzan, J.-P. (2007) · General Relativity and Gravitation · doi:10.1007/s10714-006-0385-z · Cited by 168
Metadata
- Authors
- Perivolaropoulos, L.
- Venue
- Journal of Cosmology and Astroparticle Physics
- Publisher
- IOP Publishing
- Published
- 2005-10-04
- Volume
- 2005
- Issue
- 10
- Pages
- 001-001
- ISSN
- 1475-7508 (ISSN-L)
- 1475-7516
- OpenAlex
- W2011277643
- Cited by
- 172
- References
- 8
- FWCI
- 11.71
- Type
- journal article
- Language
- en
- Open access
- bronze
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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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