Slow-roll freezing quintessence

@article{Dutta2011SlowrollFQ,
  title={Slow-roll freezing quintessence},
  author={Sourish Dutta and Robert J. Scherrer},
  journal={Physics Letters B},
  year={2011},
  volume={704},
  pages={265-269}
}
Abstract We examine the evolution of quintessence models with potentials satisfying ( V ′ / V ) 2 ≪ 1 and V ″ / V ≪ 1 , in the case where the initial field velocity is nonzero. We derive an analytic approximation for the evolution of the equation of state parameter, w, for the quintessence field. We show that such models are characterized by an initial rapid freezing phase, in which the equation of state parameter w decreases with time, followed by slow thawing evolution, for which w increases… Expand

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References

SHOWING 1-10 OF 72 REFERENCES
Slow-roll thawing quintessence
Department of Physics,College of Humanities and Sciences,Nihon University,Tokyo 156-8550, Japan(Dated: September 25, 2009)We derive slow-roll conditions for thawing quintessence. We solve theExpand
Thawing quintessence with a nearly flat potential
The thawing quintessence model with a nearly flat potential provides a natural mechanism to produce an equation of state parameter, w, close to -1 today. We examine the behavior of such models forExpand
Limits of quintessence.
We present evidence that the simplest particle-physics scalar-field models of dynamical dark energy can be separated into distinct behaviors based on the acceleration or deceleration of the field asExpand
The Paths of Quintessence
The structure of the dark energy equation of state phase plane holds important information on the nature of the physics. We explain the bounds of the freezing and thawing models of scalar field darkExpand
Evolution of inverse power law quintessence at low redshift
Quintessence models based on a scalar field, phi, with an inverse power law potential display simple tracking behavior at early times, when the quintessence energy density, rho_phi, is sub-dominant.Expand
The effective theory of quintessence: the w < 1 side unveiled
We study generic single-field dark energy models, by a parametrization of the most general theory of their perturbations around a given background, including higher derivative terms. In appropriateExpand
Direct reconstruction of the quintessence potential
We describe an algorithm which directly determines the quintessence potential from observational data, without using an equation of state parametrization. The strategy is to numerically determineExpand
Inflation and Quintessence: Theoretical Approach of Cosmological Reconstruction
In the first part of this paper, we outline the construction of an inflationary cosmology in the framework where inflation is described by a universally evolving scalar field with potential V (). ByExpand
Approximate wø ∽ Ωø Relations in Quintessence Models
Quintessence field is a widely-studied candidate of dark energy. There is "tracker solution" in quintessence models, in which evolution of the field at present times is not sensitive to its initialExpand
Quintom Cosmology: theoretical implications and observations
We review the paradigm of quintom cosmology. This scenario is motivated by the observational indications that the equation of state of dark energy across the cosmological constant boundary is mildlyExpand
...
1
2
3
4
5
...