Observational constraints on anisotropies for bouncing alternatives to inflation

Observational constraints on anisotropies for bouncing alternatives to inflation
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对通货膨胀替代方案的各向异性的观测限制

DOI:
10.1088/1475-7516/2022/10/045
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发表时间:
2022
影响因子:
6.4
通讯作者:
Wilson-Ewing, Edward
Wilson-Ewing, Edward
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Agullo, Ivan;Olmedo, Javier;Wilson-Ewing, Edward

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我们计算了背景时空中的原始各向异性如何影响宇宙学微扰的演化,以获得像发烧和物质反弹场景这样的弹跳宇宙微扰。我们发现,各向异性在宇宙收缩阶段的主序效应是在宇宙微波背景中以一种非常具体的形式诱导各向异性:尺度不变的四极角分布。次要效应是角分布中高阶矩的产生,以及标量模和张量模之间的互相关。我们还发现,宇宙微波背景对四极矩的观测约束为弹跳替代暴涨提供了允许的各向异性的强界,这些各向异性比以前基于猜想的Belinski-Khalatnikov-Lifshitz不稳定性的标度自变量得到的约束要强得多。
We calculate how primordial anisotropies in the background space-time affect the evolution of cosmological perturbations for bouncing alternatives to inflation, like ekpyrosis and the matter bounce scenario. We find that the leading order effect of anisotropies in the contracting phase of the universe is to induce anisotropies in the cosmic microwave background with a very concrete form: a scale-invariant quadrupolar angular distribution. Sub-leading effects are the generation of higher-order moments in the angular distribution, as well as cross-correlations between scalar and tensor modes. We also find that observational constraints from the cosmic microwave background on the quadrupole moment provide strong bounds on allowed anisotropies for bouncing alternatives to inflation that are significantly more constraining than the bounds previously obtained using scaling arguments based on the conjectured Belinski-Khalatnikov-Lifshitz instability.
DOI: --
发表时间: 2011-04
期刊: arXiv: Instrumentation and Methods for Astrophysics
影响因子: --
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