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arXiv 1109.6322astro-ph.CO
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在CMB中寻找暗物质:一个新物理能量注入的紧凑参数化

Searching for Dark Matter in the CMB: A Compact Parameterization of Energy Injection from New Physics

Douglas P. Finkbeiner, Silvia Galli, Tongyan Lin, Tracy R. Slatyer

摘要:

高精度测量的温度和偏振各向异性的宇宙微波背景辐射先前已被用来设置强大的约束暗物质湮灭在重组。在这项工作中,我们改进和推广这些限制适用于能量沉积在重组时代与任意红移的依赖。我们的方法还提供了更严格的和模型无关的暗物质湮灭和衰变的情况下的边界。我们采用主成分分析,以确定的能量沉积的加权函数的基础。这些权函数的系数可以作为任何能量沉积模型的参数,并且可以直接由实验来约束。对于WMAP7数据目前允许的一般能量沉积历史,普朗克可以测量多达3个主成分系数,理想宇宙方差有限实验可以测量多达5个系数。对于WIMP暗物质,我们的分析表明,对CMB的影响是由一个单一的(归一化)参数和一个“普遍的”红移依赖的能量沉积的历史。我们给出了WMAP 7的一般能量沉积历史和普遍的WIMP情况下的约束。

英文摘要:

High-precision measurements of the temperature and polarization anisotropies of the cosmic microwave background radiation have been previously employed to set robust constraints on dark matter annihilation during recombination. In this work we improve and generalize these constraints to apply to energy deposition during the recombination era with arbitrary redshift dependence. Our approach also provides more rigorous and model-independent bounds on dark matter annihilation and decay scenarios. We employ principal component analysis to identify a basis of weighting functions for the energy deposition. The coefficients of these weighting functions parameterize any energy deposition model and can be constrained directly by experiment. For generic energy deposition histories that are currently allowed by WMAP7 data, up to 3 principal component coefficients are measurable by Planck and up to 5 coefficients are measurable by an ideal cosmic variance limited experiment. For WIMP dark matter, our analysis demonstrates that the effect on the CMB is described well by a single (normalization) parameter and a "universal" redshift dependence for the energy deposition history. We give WMAP 7 constraints on both generic energy deposition histories and the universal WIMP case.

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