由流体近似引起的Ω_λ估算误差
Errors in Estimating Omega_Lambda due to the Fluid Approximation
摘要：
宇宙的物质含量在小尺度上是强烈不均匀的。基于这一事实，我们考虑一个宇宙模型，它具有规则间隔的离散质量，而不是连续的流体。这种时空的光学性质可能与连续流体的情况有很大的不同，即使“平均”动力学是相同的。我们表明，这些差异的宇宙学参数估计的后果，并拟合最近的超新星观测给出了一个修正的欧米茄_λ的推断值~ 10%。
英文摘要：
The matter content of the Universe is strongly inhomogeneous on small scales. Motivated by this fact, we consider a model of the Universe that has regularly spaced discrete masses, rather than a continuous fluid. The optical properties of such space-times can differ considerably from the continuous fluid case, even if the 'average' dynamics are the same. We show that these differences have consequences for cosmological parameter estimation, and that fitting to recent supernovae observations gives a correction to the inferred value of Omega_Lambda of ~10%.
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