大尺度结构对w的不确定性
Uncertainty on w from large-scale structure
摘要：
我们发现，如果我们生活在一个总密度对比度约为0.1的不均匀性的中心，暗能量不是一个宇宙学常数在95%的置信水平。暗能量状态方程w的观测约束强烈依赖于观测者周围的局部物质密度。我们模拟的局部不均匀性与一个精确的球对称的解决方案，其特点是一个无压的物质成分和一个暗能量流体的恒定状态方程和可以忽略的声速，达到均匀的解决方案在有限半径。我们将这个模型与局部膨胀率、遥远超新星和宇宙微波背景的观测结果相吻合。我们的结论是，从大尺度结构的可能的不确定性必须考虑到，如果一个人想要的进展，不仅精度，而且准确的宇宙学。
英文摘要：
We find that if we live at the center of an inhomogeneity with total density contrast of roughly 0.1, dark energy is not a cosmological constant at 95% confidence level. Observational constraints on the equation of state of dark energy, w, depend strongly on the local matter density around the observer. We model the local inhomogeneity with an exact spherically symmetric solution which features a pressureless matter component and a dark-energy fluid with constant equation of state and negligible sound speed, that reaches a homogeneous solution at finite radius. We fit this model to observations of the local expansion rate, distant supernovae and the cosmic microwave background. We conclude that the possible uncertainty from large-scale structure has to be taken into account if one wants to progress towards not just precision but also accurate cosmology.
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