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

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 ar...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2017-06, Vol.2017 (6), p.12-12
Main Authors: Tripathi, Ashutosh, Sangwan, Archana, Jassal, H.K.
Format: Article
Language:English
Subjects:
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
BARYONS
COMPARATIVE EVALUATIONS
DISTANCE
ENERGY DENSITY
ENERGY MODELS
EQUATIONS OF STATE
EVOLUTION
FLUIDS
NONLUMINOUS MATTER
OSCILLATIONS
RED SHIFT
SIMULATION
TIME DEPENDENCE
TYPE I SUPERNOVAE
VARIATIONS
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Summary: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.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2017/06/012