A new pressure-parametrization unified dark fluid model

Abstract

Abstract 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 $$H_0=68.34^{+0.53}_{-0.92}$$ H 0 = 68 . 34 - 0.92 + 0.53 supports the global measurement by the Planck satellite at the $$1\sigma $$ 1 σ confidence level.

Keywords

• Dark Energy
• Cosmic Microwave Background
• Baryonic Acoustic Oscillation
• Quintessence Field
• Phantom Field