Dark energy equation of state parameter and its evolution at low redshift

2016/11/30 by Ashutosh Tripathi, Archana Sangwan, H. K. Jassal · 1 citation
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysics #Barotropic fluid #Baryon acoustic oscillations #Cosmology #Cosmology and Gravitation Theories #Dark energy #Dark fluid #Equation of state #Galaxy #Geophysics and Gravity Measurements #Hubble's law #Mechanics #Physics #Quantum mechanics #Redshift #Solar and Space Plasma Dynamics #astro-ph.CO

paper · pdf · doi:10.1088/1475-7516/2017/06/012

15 pages, More detailed discussion

openalex created_date 2016/11/30 · arxiv created 2017/03/24 · openalex publication_date 2017/06/08 · arxiv updated 2017/06/21 · openalex updated_date 2026/08/05

Abstract

In this paper, we constrain dark energy models using a compendium of observations at low redshifts. We consider the dark energy as a barotropic fluid, with the equation of state a constant as well the case where dark energy equation of state is a function of time. The observations considered here are Supernova Type Ia data, Baryon Acoustic Oscillation data and Hubble parameter measurements. We compare constraints obtained from these data and also do a combined analysis. The combined observational constraints put strong limits on variation of dark energy density with redshift. For varying dark energy models, the range of parameters preferred by the supernova type Ia data is in tension with the other low redshift distance measurements.

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