Deviation from CDM: Pressure Parametrization
arXiv:0708.1072 · doi:10.1103/PhysRevD.77.043508
Abstract
Most parametrizations for dark energy involve the equation of state of the dark energy. In this work, we choose the pressure of the dark energy to parametrize. As essentially gives a cosmological constant, we use the Taylor expansion around this behavior to study the small deviations from the cosmological constant. In our model, the departure from the cosmological constant behavior has been modeled by the presence of extra K-essence fields while keeping the cosmological constant term untouched. The model is similar to assisted inflation scenario in a sense that for any higher order deviation in terms of Taylor series expansion, one needs multiple K-essence fields. We have also tested our model with the recent observational data coming from Supernova type Ia measurements, the baryon oscillations peak (BAO) and the gas mass fraction of the galaxy clusters inferred from X-ray observations and obtain constraints for our model parameters.
5 pages, 2 eps figure, the title has been changed, also some minor discussions included without changing the conclusions, Accepted in Physical Review D
References in corpus (34)
- First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
- Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
- Detection of the Baryon Acoustic Peak in the Large-Scale Correlation Function of SDSS Luminous Red Galaxies
- Type Ia Supernova Discoveries at z>1 From the Hubble Space Telescope: Evidence for Past Deceleration and Constraints on Dark Energy Evolution
- Cosmological Imprint of an Energy Component with General Equation of State
- Cosmological Constant - the Weight of the Vacuum
- An alternative to quintessence
- Exploring the Expansion History of the Universe
- Accelerating Universes with Scaling Dark Matter
- The Supernova Legacy Survey: Measurement of Omega_M, Omega_Lambda and w from the First Year Data Set
- Generalized Chaplygin Gas, Accelerated Expansion and Dark Energy-Matter Unification
- A Dynamical Solution to the Problem of a Small Cosmological Constant and Late-time Cosmic Acceleration
- k-Inflation
- Essentials of k-essence
- Cosmological Results from High-z Supernovae
- Cosmological Tracking Solutions
- Kinetically Driven Quintessence
- Perturbations in k-inflation
- Unification of Dark Matter and Dark Energy: the Inhomogeneous Chaplygin Gas
- Exploring the Expanding Universe and Dark Energy using the Statefinder Diagnostic
- Constraints on dark energy from Chandra observations of the largest relaxed galaxy clusters
- Reconstructing Dark Energy
- CDM Models with a Smooth Component
- Scrutinizing Exotic Cosmological Models Using ESSENCE Supernova Data Combined with Other Cosmological Probes
- A classification of scalar field potentials with cosmological scaling solutions
- Can the Chaplygin gas be a plausible model for dark energy?
- Assisted inflation
- 23 High Redshift Supernovae from the IfA Deep Survey: Doubling the SN Sample at z>0.7
- Cosmological constraints from the X-ray gas mass fraction in relaxed lensing clusters observed with Chandra
- Tracking K-essence
- Are Chaplygin gases serious contenders to the dark energy throne?
- Cosmological parameters from CMB measurements and the final 2dFGRS power spectrum
- Generalizing the generalized Chaplygin gas
- Measuring deviations from a cosmological constant: a field-space parameterization
Cited by in corpus (12)
- The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
- Dark Energy with Phantom Crossing and the tension
- Pressure Parametrization of Dark Energy: First and Second-Order Constraints with Latest Cosmological Data
- Multiple kinetic k-essence, phantom barrier crossing and stability
- A new pressure-parametrization unified dark fluid model
- Constraints on dark energy models from radial baryon acoustic scale measurements
- Constraints on dark energy from baryon acoustic peak and galaxy cluster gas mass measurements
- Exploring the deviation of cosmological constant by a generalized pressure dark energy model
- Crossing the cosmological constant barrier with kinetically interacting double quintessence
- A pressure parametric dark energy model
- A new pressure-parametric cosmological model
- Using the large scale quasar clustering to constrain flat quintessential universes