A new pressure-parametrization unified dark fluid model

• Published in: The European physical journal. C, Particles and fields Vol. 77; no. 4; pp. 1 - 9
• Main Authors: Wang, Deng, Yan, Yang-Jie, Meng, Xin-He
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.04.2017; Springer; Springer Nature B.V; SpringerOpen
• Subjects: Analysis; Astronomy; Astrophysics and Cosmology; Baryonic Acoustic Oscillation; Baryons; Big Bang theory; Confidence intervals; Cosmic background radiation; Cosmic Microwave Background; Dark Energy; Dark matter; Elementary Particles; Energy (Physics); Hadrons; Heavy Ions; Hubble constant; Measurement Science and Instrumentation; Nuclear Energy; Nuclear Physics; Parameterization; Phantom Field; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quintessence (cosmology); Quintessence Field; Regular Article - Theoretical Physics; String Theory; Universe; Baryonic Acoustic Oscillation; Phantom Field; Dark Energy; Quintessence Field; Cosmic Microwave Background
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-017-4827-4

We propose a new pressure-parametrization model to explain the accelerated expansion of the late-time Universe by considering the baryon matter and dark contents (dark matter and dark energy) as a unified dark fluid. To realize this model more physically, we reconstruct it with the quintessence and phantom scalar fields, respectively. We use the recent cosmological data to constrain this model, distinguish it from the standard cosmological model and find that the value of the Hubble constant H 0 = 68 . 34 - 0.92 + 0.53 supports the global measurement by the Planck satellite at the 1 σ confidence level.