Nonminimal quintessence and phantom with nearly flat potentials

Journal Article · Mon Jun 15 00:00:00 EDT 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.79.123013· OSTI ID:21300931

Gupta, Gaveshna; Sen, Anjan A ^[1]; Saridakis, Emmanuel N ^[2]

---

1. Center For Theoretical Physics, Jamia Millia Islamia, New Delhi 110025 (India)
2. Department of Physics, University of Athens, GR-15771 Athens (Greece)

We investigate quintessence and phantom dark-energy scenarios, in which the scalar fields evolve in nearly flat potentials and are nonminimally coupled to gravity. We show that all such models converge to a common behavior and we provide the corresponding approximate analytical expressions for w({omega}{sub {phi}}) and w(a). We find that nonminimal coupling leads to richer cosmological behavior compared to its minimal counterpart. In addition, comparison with baryon acoustic oscillation and the latest supernovae data reveals that agreement can be established more easily and with less strict constraints on the model parameters.

• OSTI ID: 21300931
• Journal Information: Physical Review. D, Particles Fields, Vol. 79, Issue 12; Other Information: DOI: 10.1103/PhysRevD.79.123013; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
APPROXIMATIONS
BARYONS
COMPARATIVE EVALUATIONS
COUPLING
GRAVITATION
NONLUMINOUS MATTER
OSCILLATIONS
PHANTOMS
SCALAR FIELDS
SUPERNOVAE