A pressure parametric dark energy model

Abstract

In this paper, we propose a new pressure parametric model of the total cosmos energy components in a spatially flat Friedmann-Robertson-Walker (FRW) universe and then reconstruct the model into quintessence and phantom scenarios, respectively. By constraining with the datasets of the type Ia supernova (SNe Ia), the baryon acoustic oscillation (BAO) and the observational Hubble parameter data(OHD), we find that ${\Omega }_{m0}=0.270_{-0.034}^{+0.039}$ at the 1$\sigma$ level and our universe slightly biases towards quintessence behavior. Then we use two diagnostics including $Om(a)$ diagnostic and statefinder to discriminate our model from the cosmology constant cold dark matter ($\Lambda$CDM) model. From $Om(a)$ diagnostic, we find that our model has a relatively large deviation from the $\Lambda$CDM model at high redshifts and gradually approaches the $\Lambda$CDM model at low redshifts and in the future evolution, but they can be easily differentiated from each other at the 1$\sigma$ level all along. By the statefinder, we find that both of quintessence case and phantom case can be well distinguished from the $\Lambda$CDM model and will gradually deviate from each other. Finally, we discuss the fate of universe evolution (named the rip analysis) for the phantom case of our model and find that the universe will run into a little rip stage.

arXiv comment13 pages, 7 figures and 4 tables

References in corpus (30)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• The 6dF Galaxy Survey: Baryon Acoustic Oscillations and the Local Hubble Constant
• The Cosmological Constant
• Exploring the Expansion History of the Universe
• Accelerating Universes with Scaling Dark Matter
• Phantom Energy and Cosmic Doomsday
• Baryon Acoustic Oscillations in the Sloan Digital Sky Survey Data Release 7 Galaxy Sample
• The Hubble Space Telescope Cluster Supernova Survey: V. Improving the Dark Energy Constraints Above z>1 and Building an Early-Type-Hosted Supernova Sample
• Statefinder -- a new geometrical diagnostic of dark energy
• Constraints on the redshift dependence of the dark energy potential
• A 6% measurement of the Hubble parameter at $z\sim 0.45$: direct evidence of the epoch of cosmic re-acceleration
• Cosmic Chronometers: Constraining the Equation of State of Dark Energy. I: H(z) Measurements
• Raising the bar: new constraints on the Hubble parameter with cosmic chronometers at z$\sim$2
• Improved constraints on the expansion rate of the Universe up to z~1.1 from the spectroscopic evolution of cosmic chronometers
• The WiggleZ Dark Energy Survey: mapping the distance-redshift relation with baryon acoustic oscillations
• The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations in the Data Release 9 Spectroscopic Galaxy Sample
• Baryon Acoustic Oscillations in the Lyα forest of BOSS DR11 quasars
• Two new diagnostics of dark energy
• Constraining dark energy with SNe Ia and large-scale structure
• Quasar-Lyman $\alpha$ Forest Cross-Correlation from BOSS DR11 : Baryon Acoustic Oscillations
• Constraints on the equation of state of dark energy and the Hubble constant from stellar ages and the CMB
• Measurement of BAO correlations at $z=2.3$ with SDSS DR12 \lya-Forests
• WMAP constraints on low redshift evolution of dark energy
• Baryon acoustic oscillations from the complete SDSS-III Ly$\alpha$-quasar cross-correlation function at $z=2.4$
• The Little Rip
• Phenomenological parameterization of quintessence
• Pseudo-rip: Cosmological models intermediate between the cosmological constant and the little rip
• A new pressure-parametrization unified dark fluid model
• Deviation from $\Lambda$CDM: Pressure Parametrization
• Deviation From ΛCDM With Cosmic Strings Networks

Cited by in corpus (1)

• Exploring the deviation of cosmological constant by a generalized pressure dark energy model