Constraints on the anisotropy of dark energy

Constraints on the anisotropy of dark energy
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暗能量各向异性的约束

DOI:
10.1103/physrevd.81.081301
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发表时间:
2010
期刊:
影响因子:
5
通讯作者:
Appleby S
Appleby S
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Appleby S

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如果暗能量的状态方程是各向异性的,则宇宙微波背景中将存在附加的四极各向异性,这是由含时的各向异性应力所引起的。假设观测到的四极杆的整个幅度是由这种各向异性引起的,我们保守地对任何假设的值施加一个极限。这比来自超新星的要紧密得多。对于和的特定值,可能会有更强的限制,最高可达10倍。由于我们假设这个分量与通货膨胀的随机分量不相关,我们发现期望值和样本方差都增加了。之前在椭圆宇宙上的工作表明,出现异常低的四极杆的可能性并没有改善。
If the equation of state of dark energy is anisotropic there will be additional quadrupole anisotropy in the cosmic microwave background induced by the time-dependent anisotropic stress quantified in terms of. Assuming that the entire amplitude of the observed quadrupole is due to this anisotropy, we conservatively impose a limit offor any value ofassuming that. This is considerably tighter than that which comes from supernovae. Stronger limits, up to a factor of 10, are possible for specific values ofand. Since we assume this component is uncorrelated with the stochastic component from inflation, we find that both the expectation value and the sample variance are increased. There is no improvement in the likelihood of an anomalously low quadrupole as suggested by previous work on an elliptical universe.
宇宙中的超新星
DOI: --
发表时间: 2006
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