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

被引：55

作者：

Tripathi, Ashutosh ^{[1
,2
,3
]}

Sangwan, Archana ^{[1
]}

Jassal, H. K. ^{[1
]}

机构：

[1] Indian Inst Sci Educ & Res Mohali, Mohali 140306, Punjab, India

[2] Fudan Univ, Ctr Field Theory & Particle Phys, Shanghai 200433, Peoples R China

[3] Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2017年 / 06期

关键词：

dark energy theory; baryon acoustic oscillations; supernova type Ia - standard candles; BARYON ACOUSTIC-OSCILLATIONS; DECELERATION-ACCELERATION TRANSITION; HUBBLE PARAMETER; MEASUREMENT CONSTRAINTS; COSMOLOGICAL CONSTRAINTS; SUPERNOVA; UNIVERSE; LAMBDA; PROSPECTS; CONSTANT;

D O I：

10.1088/1475-7516/2017/06/012

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：16

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