大连理工大学主页平台管理系统徐立昕--中文主页-- Viscous generalized Chaplygin gas as a unified dark fluid: including perturbation of bulk viscosity

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Viscous generalized Chaplygin gas as a unified dark fluid: including perturbation of bulk viscosity

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论文类型：期刊论文
发表时间：2014-02-20
发表刊物：EUROPEAN PHYSICAL JOURNAL C
收录刊物：SCIE
文献类型：J
卷号：74
期号：2
ISSN号：1434-6044
摘要：In this paper, we continue our previous work of studying viscous generalized Chaplygin gas as a unified dark fluid but the bulk viscosity perturbations. By using the currently available cosmic observational data from SNLS3, BAO, HST, and recently released Planck, we obtain a constraint on the bulk viscosity coefficient: zeta 0 = 0.0000138(-0.0000105-0.0000138-0.0000138)(+0.00000614+0.0000145+0.0000212) in 1, 2, 3 sigma regions, respectively, via the Markov Chain MonteCarlo method. The result shows that when considering perturbations of the bulk viscosity, the current cosmic observations favor a smaller bulk viscosity coefficient.

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