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Quintessence and supergravity
Open accessAbstract
Abstract In the context of quintessence, the concept of tracking solutions allows to address the fine-tuning and coincidence problems. When the field is on tracks today, one has Q ≈ m Pl demonstrating that, generically, any realistic model of quintessence must be based on supergravity. We construct the most simple model for which the scalar potential is positive. The scalar potential deduced from the supergravity model has the form V(Q)= Λ 4+α Q α e κ 2 Q 2 . We show that despite the appearance of positive powers of the field, the coincidence problem is still solved. If α ≥11, the fine-tuning problem can be overcome. Moreover, due to the presence of the exponential term, the value of the equation of state, ω Q , is pushed towards the value −1 in contrast to the usual case for which it is difficult to go beyond ω Q ≈−0.7. For Ω m ≈0.3 , the model presented here predicts ω Q ≈−0.82. Finally, we establish the Ω m −ω Q relation for this model.
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Cites
The hierarchy problem and new dimensions at a millimeter
Arkani–Hamed, N., Dimopoulos, S., & Dvali, G. (1998) · Physics Letters B · doi:10.1016/s0370-2693(98)00466-3 · Cited by 6,563
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
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
Exploring the Expansion History of the Universe
Linder, E. V. (2003) · Physical Review Letters · doi:10.1103/physrevlett.90.091301 · Cited by 2,526
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
Martin, J. (2012) · Comptes Rendus. Physique · doi:10.1016/j.crhy.2012.04.008 · Cited by 913
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Metadata
- Authors
- Brax, P., & Martin, J.
- Venue
- Physics Letters B
- Publisher
- Elsevier BV
- Published
- 1999-11
- Volume
- 468
- Issue
- 1-2
- Pages
- 40-45
- ISSN
- 0370-2693 (ISSN-L)
- OpenAlex
- W2007667461
- Cited by
- 380
- References
- 2
- FWCI
- 18.21
- Type
- journal article
- Language
- en
- Open access
- green
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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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