Constraining Equation of State of Dark Matter： Including Weak Gravitational Lensing

Usually the equation of state （EoS） of dark matter is zero when it is cold, however there exists the possibility of a （effective） nonzero EoS of dark matter due to its decay and interaction with dark energy. In this work, we try to constrain the EoS of dark matter/JAdm using the currently available...

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Bibliographic Details
Published in:Chinese physics letters 2015-05, Vol.32 (5), p.183-187
Main Author: 杨磊 杨维强 徐立昕
Format: Article
Language:English
Subjects:
Dark matter
Data points
Equations of state
Gravitational lenses
Ia型超新星
Luminosity
Monte Carlo methods
Oscillations
Supernovae
几何测量
动态测量
宇宙微波背景辐射
引力透镜
暗物质
约束方程
马尔可夫链
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Summary:Usually the equation of state （EoS） of dark matter is zero when it is cold, however there exists the possibility of a （effective） nonzero EoS of dark matter due to its decay and interaction with dark energy. In this work, we try to constrain the EoS of dark matter/JAdm using the currently available cosmic observations which include the geometrical and dynamical measurements. For the geometrical measurements, the luminosity distance of type Ia supernovae, the angular diameter distance and comoving sound horizon from baryon acoustic oscillations and the cosmic microwave background radiation will be employed. The data points from the redshift-space distortion and weak gravitational lensing will be taken as dynamical measurements. Using the Markov chain Monte Carlomethod, we obtain a very tight constraint on the-EoS of dark matter：wdm=0.0000532 ＋0.000692＋0.00136＋0.00183 -0.000686-0.00136-0.00177.
ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/32/5/059801