# A parametric model for dark energy

@article{Barboza2008APM, title={A parametric model for dark energy}, author={Ed'esio M. Barboza and Jailson Alcaniz}, journal={Physics Letters B}, year={2008}, volume={666}, pages={415-419} }

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

#### 106 Citations

Latest astronomical constraints on some non-linear parametric dark energy models

- Physics
- 2017

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 of… Expand

Scalar field description for parametric models of dark energy

- Physics
- 2012

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 energy… Expand

Observational constraints on oscillating dark-energy parametrizations

- Physics
- Physical Review D
- 2018

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

- Physics
- Physical Review D
- 2019

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 its… Expand

A New Model of Dark Energy EoS : Constrains on Free Parameters and Related Cosmological Parameters

- Physics
- 2019

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, the… Expand

The effects of parametrization of the dark energy equation of state

- Physics
- 2011

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 Om… Expand

A divergence-free parametrization for dynamical dark energy

- Physics
- 2015

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 the… Expand

Future constraints on dynamical dark-energy using gravitational-wave standard sirens

- Physics
- Physical Review D
- 2019

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 energy… Expand

Bayesian evidences for dark energy models in light of current observational data

- Physics
- 2017

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, Growth… Expand

A kinematic method to probe cosmic acceleration

- Physics
- 2012

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 discussed… Expand

#### References

SHOWING 1-10 OF 102 REFERENCES

A theoretician's analysis of the supernova data and the limitations in determining the nature of dark energy

- Mathematics, Physics
- 2003

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 cosmological… Expand

Observational constraints on late-time Lambda(t) cosmology

- Physics
- 2008

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 the… Expand

Dynamics of dark energy

- Physics
- 2006

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 recent… Expand

Constraints on the redshift dependence of the dark energy potential

- Physics
- 2005

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 and… Expand

Some observational consequences of brane world cosmologies

- Physics
- 2002

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 vacuum… Expand

Supernova constraints on decaying vacuum cosmology

- Physics
- 2006

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 seems… Expand

Complementary constraints on brane cosmology

- Physics
- 2005

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 two… Expand

The Cosmological Constant and Dark Energy

- Physics
- 2003

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 or… Expand

Cosmological consequences of a Chaplygin gas dark energy

- Physics
- 2003

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 the… Expand

Cosmology with Decaying Vacuum Energy

- Physics
- 1987

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 matter… Expand