用SNe Ia，CMB和LSS约束体粘滞物质主导的宇宙学模型
Constraining a bulk viscous matter-dominated cosmological model using SNe Ia, CMB and LSS
摘要：
我们提出并约束了一个宇宙模型，该模型的组成部分是一个无压流体的体积粘度作为目前的宇宙加速膨胀的解释。研究了体积粘度系数为常数的特殊模型.利用2006年超新星Ia金样品的宇宙学检验、WMAP三年观测的CMB位移参数R、Sloan数字巡天（SDSS）的重子声学振荡（BAO）峰A和热力学第二定律，对α_m的可能值进行了约束。结果发现，该模型是在协议与仅使用SNe Ia测试的时间序列。然而，当模型一起提交给三个宇宙学检验（SNe+CMB+BAO）时，结果是：该模型违反了第二条，2.预测哈勃常数的H_0 \approx值为53 km sec^{-1} Mpc^{-1}，3.-我们获得了与具有χ^2_{min} \approx 400（χ^2_{d.o.f.} \approx 2.2）。这些结果表明，该模型被观测结果所排除。
英文摘要：
We present and constrain a cosmological model which component is a pressureless fluid with bulk viscosity as an explanation for the present accelerated expansion of the universe. We study the particular model of a constant bulk viscosity coefficient ζ_m. The possible values of ζ_m are constrained using the cosmological tests of SNe Ia Gold 2006 sample, the CMB shift parameter R from the three-year WMAP observations, the Baryon Acoustic Oscillation (BAO) peak A from the Sloan Digital Sky Survey (SDSS) and the Second Law of Thermodynamics (SLT). It was found that this model is in agreement with the SLT using only the SNe Ia test. However when the model is submitted to the three cosmological tests together (SNe+CMB+BAO) the results are: 1.- the model violates the SLT, 2.- predicts a value of H_0 \approx 53 km sec^{-1} Mpc^{-1} for the Hubble constant, and 3.- we obtain a bad fit to data with a χ^2_{min} \approx 400 (χ^2_{d.o.f.} \approx 2.2). These results indicate that this model is ruled out by the observations.
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