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Title: Non-minimal quintessence with nearly flat potential

Abstract

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.

Authors:
;  [1];  [2]
  1. Center For Theoretical Physics, Jamia Millia Islamia, New Delhi 110025 (India)
  2. Harish Chandra Research Institute, Chhatnag Raod, Jhunsi, Allahabad 211019 (India)
Publication Date:
OSTI Identifier:
22273039
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2009; Journal Issue: 09; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; BARYONS; BRANES; COSMOLOGY; EQUATIONS OF STATE; LIMITING VALUES; NONLUMINOUS MATTER; OSCILLATIONS; POTENTIALS; SCALAR FIELDS

Citation Formats

Sen, Anjan A., Gupta, Gaveshna, and Das, Sudipta. Non-minimal quintessence with nearly flat potential. United States: N. p., 2009. Web. doi:10.1088/1475-7516/2009/09/027.
Sen, Anjan A., Gupta, Gaveshna, & Das, Sudipta. Non-minimal quintessence with nearly flat potential. United States. https://doi.org/10.1088/1475-7516/2009/09/027
Sen, Anjan A., Gupta, Gaveshna, and Das, Sudipta. 2009. "Non-minimal quintessence with nearly flat potential". United States. https://doi.org/10.1088/1475-7516/2009/09/027.
@article{osti_22273039,
title = {Non-minimal quintessence with nearly flat potential},
author = {Sen, Anjan A. and Gupta, Gaveshna and Das, Sudipta},
abstractNote = {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.},
doi = {10.1088/1475-7516/2009/09/027},
url = {https://www.osti.gov/biblio/22273039}, journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 09,
volume = 2009,
place = {United States},
year = {Tue Sep 01 00:00:00 EDT 2009},
month = {Tue Sep 01 00:00:00 EDT 2009}
}