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

作者：Tripathi, Ashutosh; Sangwan, Archana; Jassal, H. K.^*

来源：Journal of Cosmology and Astroparticle Physics, 2017, 2017(6): 012.

DOI：10.1088/1475-7516/2017/06/012

• dark energy theory
• baryon acoustic oscillations
• supernova type Ia - standard candles

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.

• 出版日期2017-6
• 单位复旦大学