58 Citations
Quintessence model and observational constraints
- Physics
- 2002
Recent observations of type Ia supernovae strongly support the view that the universe is accelerating now and decelerated in the recent past. By assuming a general relation between the quintessence…
Coupled quintessence with double exponential potentials
- Physics
- 2014
We study flat Friedmann-Robertson-Walker (FRW) models with a perfect fluid matter source and a scalar field non minimally coupled to matter having a double exponential potential. It is shown that the…
Acceleration of the universe with a simple trigonometric potential
- Physics
- 2005
In this paper, we investigate the quintessence model with a minimally coupled scalar field in the context of recent supernovae observations. By choosing a particular form of the deceleration…
On quintessential cosmological models and exponential potentials
- Physics
- 2012
We first study dark energy models with a minimally-coupled scalar field and generalized exponential potentials, admitting exact solutions for the cosmological equations: actually, it turns out that…
A reconstruction of quintessence dark energy
- Physics
- 2015
With a parametric form of the equation of state parameter of dark energy, a quintessence potential has been reconstructed. The potential is found to be a generalization of a double exponential…
Dynamics of quintessence models of dark energy with exponential coupling to dark matter
- Physics
- 2006
We explore quintessence models of dark energy which exhibit non-minimal coupling between the dark matter and dark energy components of the cosmic fluid. The kind of coupling chosen is inspired by…
Transient accelerating scalar models with exponential potentials
- Physics
- 2013
We study a known class of scalar dark energy models in which the potential has an exponential term and the current accelerating era is transient. We find that, although a decelerating era will return…
Coupled quintessence and vacuum decay
- Physics
- 2008
We discuss observational consequences of a class of cosmological models characterized by the dilution of pressureless matter attenuated with respect to the usual a{sup -3} scaling due to the decay of…
A new parametrization of dark energy equation of state leading to double exponential potential
- PhysicsResearch in Astronomy and Astrophysics
- 2018
We show that a phenomenological form of energy density for the scalar field can provide the required transition from decelerated (q > 0) to accelerated expansion (q < 0) phase of the universe. We…
Stability analysis in tachyonic potential chameleon cosmology
- Physics
- 2011
We study general properties of attractors for tachyonic potential chameleon scalar-field model which possess cosmological scaling solutions. An analytic formulation is given to obtain fixed points…
References
SHOWING 1-10 OF 45 REFERENCES
Quintessence, the gravitational constant, and gravity
- Physics, Geology
- 1999
Dynamical vacuum energy or quintessence, a slowly varying and spatially inhomogeneous component of the energy density with negative pressure, is currently consistent with the observational data. One…
Nonminimal coupling and quintessence
- Physics
- 2000
Recent studies of type Ia supernovas with redshifts up to about $z\ensuremath{\lesssim}1$ reveal evidence for a cosmic acceleration in the expansion of the Universe. The most straightforward…
New cosmological model of quintessence and dark matter
- Physics
- 2000
We propose a new class of quintessence models in which late times oscillations of a scalar field give rise to an effective equation of state which can be negative and hence drive the observed…
Compactification, Vacuum Energy and Quintessence
- Physics
- 1999
We study the possibility that the vacuum energydensity of scalar and internal-space gauge fieldsarising from the process of dimensional reduction ofhigher dimensional gravity theories plays the role…
Extended quintessence
- PhysicsPhysical Review D
- 1999
We study Quintessence cosmologies in the context of scalar-tensor theories of gravity, where a scalar field φ , assumed to provide most of the cosmic energy density today, is non-minimally coupled to…
Quintessence arising from exponential potentials
- Mathematics
- 2000
We demonstrate how the properties of the attractor solutions of exponential potentials can lead to models of quintessence with the currently observationally favored equation of state. Moreover, we…
Quintessence, cosmic coincidence, and the cosmological constant
- Physics
- 1999
Recent observations suggest that a large fraction of the energy density of the Universe has negative pressure. One explanation is vacuum energy density; another is quintessence in the form of a…
Tracker fields from nonminimally coupled theory
- Mathematics
- 2000
We extend the concept of quintessence to a flat nonminimally coupled scalar - tensor theories of gravity. By means of Noether's symmetries for the cosmological pointlike Lagrangian L, it is possible…
Cosmology in scalar tensor theory and asymptotically de Sitter universe
- Physics
- 2001
We have investigated the cosmological scenarios with a four-dimensional effective action which is connected with multidimensional, supergravity and string theories. The solution for the scale factor…
Axion and Almost Massless Quark as Ingredients of Quintessence
- Physics
- 1998
It is pointed out that a natural introduction of quintessence is an axion with an almost massless quark. With an appropriate gauge or discrete symmetry, one can obtain the quintessence potential…