A separate universe view of the asymmetric sky
A separate universe view of the asymmetric sky
复制标题
不对称天空的独立宇宙观
DOI：
10.1088/1475-7516/2015/05/029
复制
发表时间：
2015
影响因子：
6.4
通讯作者：
Kobayashi T
中科院分区：
文献类型：
--
作者：
Kobayashi T
我们使用δ脚本N形式统一地描述了由Erickcek，Kamionkowski和Carroll提出的机制产生的宇宙微波背景中的半球不对称性，该形式自始至终一致地解释了非对称性产生模式。我们导出了功率谱的一般形式，它显式地表现出破缺的平移不变性。这可以直接与宇宙微波背景观测值进行比较，包括观测到的四极和fNL值，自动纳入Grishchuk-Zel‘dovich效应。我们的计算统一和扩展了文献中以前的计算，特别是给出了在产生不对称性的超视界模式中，我们的位置与我们的位置的完全依赖关系。我们演示了以前的作者所得到的明显不同的结果是如何作为不同的极限情况出现的。我们证实了Erickcek等人发现的超视界模式对微波背景四极子的非线性贡献的存在。并由Kanno等人进一步探索，并表明这些贡献在能够解释观察到的不对称性的参数范围内总是显著的。我们给出了能够解释观察到的功率不对称性而不违反其他观测界限的示例参数值。
We provide a unified description of the hemispherical asymmetry in the cosmic microwave background generated by the mechanism proposed by Erickcek, Kamionkowski, and Carroll, using a δ Script N formalism that consistently accounts for the asymmetry-generating mode throughout. We derive a general form for the power spectrum which explicitly exhibits the broken translational invariance. This can be directly compared to cosmic microwave background observables, including the observed quadrupole and f NL values, automatically incorporating the Grishchuk-Zel'dovich effect. Our calculation unifies and extends previous calculations in the literature, in particular giving the full dependence of observables on the phase of our location in the super-horizon mode that generates the asymmetry. We demonstrate how the apparently different results obtained by previous authors arise as different limiting cases. We confirm the existence of non-linear contributions to the microwave background quadrupole from the super-horizon mode identified by Erickcek et al. and further explored by Kanno et al., and show that those contributions are always significant in parameter regimes capable of explaining the observed asymmetry. We indicate example parameter values capable of explaining the observed power asymmetry without violating other observational bounds.
影响因子：
6.5
作者：
Ade, P. A. R.;Aghanim, N.;Zonca, A.
通讯作者：
Zonca, A.
影响因子：
6.4
作者：
D. Lyth;Karim A. Malik;M. Sasaki
通讯作者：
D. Lyth;Karim A. Malik;M. Sasaki