Non-minimal quintessence with nearly flat potential
- Center For Theoretical Physics, Jamia Millia Islamia, New Delhi 110025 (India)
- Harish Chandra Research Institute, Chhatnag Raod, Jhunsi, Allahabad 211019 (India)
We consider Brans-Dicke type nonminimally coupled scalar field as a candidate for dark energy. In the conformally transformed Einstein's frame, our model is a coupled quintessence model. In such models, we consider potentials for the scalar field which satisfy the slow-roll conditions: [(1/V)(dV/dφ)]{sup 2} << 1 and (1/V)(d{sup 2}V/dφ{sup 2}) << 1. For such potentials, we show that the equation of state for the scalar field can be described by a universal behaviour, provided the scalar field rolls only in the flat part of the potentials where the slow-roll conditions are satisfied. Our work generalizes the previous work by Scherrer and Sen [7] for minimally coupled scalar field case. We have also studied the observational constraints on the model parameters considering the Supernova and BAO observational data.
- OSTI ID:
- 22273039
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2009, Issue 09; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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