A parametric model for dark energy

  title={A parametric model for dark energy},
  author={Ed'esio M. Barboza and Jailson Alcaniz},
  journal={Physics Letters B},
Abstract Determining the mechanism behind the current cosmic acceleration constitutes a major question nowadays in theoretical physics. If the dark energy route is taken, this problem may potentially bring to light new insights not only in cosmology but also in high energy physics theories. Following this approach, we explore in this Letter some cosmological consequences of a new time-dependent parameterization for the dark energy equation of state (EoS), which is a well behaved function of the… Expand

Figures from this paper

Latest astronomical constraints on some non-linear parametric dark energy models
We consider nonlinear redshift-dependent equation of state parameters as dark energy models in a spatially flat Friedmann-Lema\^{\i}tre-Robertson-Walker universe. To depict the expansion history ofExpand
Scalar field description for parametric models of dark energy
Observato´rio Nacional, 20921-400, Rio de Janeiro - RJ, Brasil(Dated: July 14, 2011)We investigate theoretical and observational aspects of a time-dependent parameterization for thedark energyExpand
Observational constraints on oscillating dark-energy parametrizations
We perform a detailed confrontation of various oscillating dark-energy parame-trizations with the latest sets of observational data. In particular, we use data from Joint Light Curve analysis (JLA)Expand
Observational constraints on one-parameter dynamical dark-energy parametrizations and the H0 tension
The phenomenological parametrizations of dark-energy (DE) equation of state can be very helpful, since they allow for the investigation of its cosmological behavior despite the fact that itsExpand
A New Model of Dark Energy EoS : Constrains on Free Parameters and Related Cosmological Parameters
Since the Ia supernovae observations of late 1990’s, it has been predicted that our universe is experiencing a late time cosmic acceleration. To build a theoretical support to this observation, theExpand
The effects of parametrization of the dark energy equation of state
We investigate in detail the influence of parametrizations of the dark energy equation of state on reconstructing dark energy geometrical parameters, such as the deceleration parameter q(z) and OmExpand
A divergence-free parametrization for dynamical dark energy
We introduce a new parametrization for the dark energy, led by the same idea to the linear expansion of the equation of state in scale factor $a$ and in redshift $z$, which diverges neither in theExpand
Future constraints on dynamical dark-energy using gravitational-wave standard sirens
The detection of gravitational waves (GW) by the LIGO and Virgo collaborations offers a whole new range of possible tests and opens up a new window that may shed light on the nature of dark energyExpand
Bayesian evidences for dark energy models in light of current observational data
We do a comprehensive study of the Bayesian evidences for a large number of dark energy models using a combination of latest cosmological data from SNIa, CMB, BAO, Strong lensing time delay, GrowthExpand
A kinematic method to probe cosmic acceleration
Abstract We propose a method to map the cosmological evolution of the main kinematic parameters H, q and j from observational data. Unlike the traditional approach, the methodology here discussedExpand


A theoretician's analysis of the supernova data and the limitations in determining the nature of dark energy
Current cosmological observations show a strong signature of the existence of a dark energy component with negative pressure. The most obvious candidate for this dark energy is the cosmologicalExpand
Observational constraints on late-time Lambda(t) cosmology
The cosmological constant {lambda}, i.e., the energy density stored in the true vacuum state of all existing fields in the Universe, is the simplest and the most natural possibility to describe theExpand
Dynamics of dark energy
We review in detail a number of approaches that have been adopted to try and explain the remarkable observation of our accelerating universe. In particular we discuss the arguments for and recentExpand
Constraints on the redshift dependence of the dark energy potential
We develop a formalism to characterize the shape and the redshift evolution of the dark energy potential. Our formalism makes use of quantities similar to the horizon-flow parameters in inflation andExpand
Some observational consequences of brane world cosmologies
The presence of dark energy in the Universe is inferred directly and indirectly from a large body of observational evidence. The simplest and most theoretically appealing possibility is the vacuumExpand
Supernova constraints on decaying vacuum cosmology
There is mounting observational evidence that the expansion of our Universe is undergoing a late-time acceleration. Among many proposals to describe this phenomenon, the cosmological constant seemsExpand
Complementary constraints on brane cosmology
The acceleration of the expansion of the universe represents one of the major challenges to our current understanding of fundamental physics. In principle, to explain this phenomenon, at least twoExpand
The Cosmological Constant and Dark Energy
Physics invites the idea that space contains energy whose gravitational effect approximates that of Einstein's cosmological constant, Lambda: nowadays the concept is termed dark energy orExpand
Cosmological consequences of a Chaplygin gas dark energy
A combination of recent observational results has given rise to what is currently known as the dark energy problem. Although several possible candidates have been extensively discussed in theExpand
Cosmology with Decaying Vacuum Energy
Abstract Motivated by recent attempts to solve the cosmological constant problem, we examine the observational consequences of a vacuum energy which decays in time. In both radiation and matterExpand