What the small angle CMB really tells us about the curvature of the Universe
What the small angle CMB really tells us about the curvature of the Universe
复制标题
小角度 CMB 真正告诉我们关于宇宙曲率的信息
DOI:
10.1088/1475-7516/2009/07/029
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发表时间:
2009
影响因子:
6.4
通讯作者:
Clifton T
中科院分区:
文献类型:
--
作者:
Clifton T
It is well known that observations of the cosmic microwave background (CMB) are highly sensitive to the spatial curvature of the Universe, k. Here we find that what is in fact being tightly constrained by small angle fluctuations is spatial curvature near the surface of last scattering, and that if we allow k to be a function of position, rather than taking a constant value everywhere, then considerable spatial curvature is permissible within our own locale. This result is of interest for the giant void models that attempt to explain the supernovae observations without Dark Energy. We find such voids to be compatible with the observed small angle CMB, but they must be either very deep (and unnaturally empty) or exist in a positively curved Universe.
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2001
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