The cosmic microwave background in an inhomogeneous universe
The cosmic microwave background in an inhomogeneous universe
复制标题
DOI：
10.1088/1475-7516/2011/02/013
复制
发表时间：
2010-07
影响因子：
6.4
通讯作者：
C. Clarkson;M. Regis
中科院分区：
文献类型：
--
作者：
C. Clarkson;M. Regis
Ia型超新星的变暗可能是物质和空间曲率的哈勃尺度不均匀性的结果，而不是暗能量成分存在的信号。这种模型的一个关键挑战是拟合宇宙微波背景（CMB）的详细光谱。我们提出了一个详细的讨论，在一个不均匀的宇宙中的小尺度CMB，专注于球对称的“空”模型。我们允许辐射的动力学效应，同时分析的问题，与其他工作，无意中微调其空间分布。这是一个令人惊讶的重要效应，我们得出了截然不同的结论。在宇宙微波背景辐射距离上开放的模型适合于宇宙微波背景辐射的功率谱，而不需要微调;这些模型也适合于超新星和当地哈勃速率数据，这些数据有利于高膨胀率。渐近平坦模型可能适合CMB，但需要一些额外的假设。我们认为，在这些模型中的辐射的充分治疗是必要的，如果我们要了解正确的约束，从CMB，以及其他观测依赖于它，如光谱畸变的黑体光谱，运动学Sunyaev-Zeldovich效应或重子声振荡。
The dimming of Type Ia supernovae could be the result of Hubble-scale inhomogeneity in the matter and spatial curvature, rather than signaling the presence of a dark energy component. A key challenge for such models is to fit the detailed spectrum of the cosmic microwave background (CMB). We present a detailed discussion of the small-scale CMB in an inhomogeneous universe, focusing on spherically symmetric `void' models. We allow for the dynamical effects of radiation while analyzing the problem, in contrast to other work which inadvertently fine tunes its spatial profile. This is a surprisingly important effect and we reach substantially different conclusions. Models which are open at CMB distances fit the CMB power spectrum without fine tuning; these models also fit the supernovae and local Hubble rate data which favour a high expansion rate. Asymptotically flat models may fit the CMB, but require some extra assumptions. We argue that a full treatment of the radiation in these models is necessary if we are to understand the correct constraints from the CMB, as well as other observations which rely on it, such as spectral distortions of the black body spectrum, the kinematic Sunyaev-Zeldovich effect or the Baryon Acoustic Oscillations.