Quintessence model with double exponential potential

  title={Quintessence model with double exponential potential},
  author={Amartya Sen and Savdeep Sethi},
  journal={Physics Letters B},

Figures from this paper

Quintessence model and observational constraints

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

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

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

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

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

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

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

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

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

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



Quintessence, the gravitational constant, and gravity

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

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

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

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

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

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

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

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

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

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