Dark energy equation of state parameter and its variation at low redshifts
Dark energy equation of state parameter and its variation at low redshifts
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暗能量状态参数方程及其低红移变化
DOI：
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发表时间：
2016
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通讯作者：
H. K. Jassal
中科院分区：
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作者：
Ashutosh Tripathi;Archana Sangwan;H. K. Jassal
在这篇文章中，我们使用一个低红移观测概要来约束暗能量模型。我们考虑暗能量为正压流体，状态方程为常数，以及暗能量状态方程为时间函数的情况。这里考虑的观测数据是超新星Ia型数据、重子声振荡数据和哈勃参数测量。我们比较从这些数据获得的约束，并进行组合分析。综合的观测约束对暗能量密度随红移的变化有很强的限制。对于不同的暗能量模型，超新星Ia型数据首选的参数范围与其他低红移距离的测量结果是紧张的。
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, Baryonic 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 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.