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SPHERICAL HARMONIC EXPANSION OF GAMMA-RAY BURST DISTRIBUTIONS: PROBING LARGE-SCALE STRUCTURE?

机译:伽马射线爆裂分布的球谐扩张:可能是大型结构?

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摘要

We have laid down the formalism and techniques necessary for computing the multipole components in a spherical harmonic expansion for bursting sources given any specific power spectrum of density perturbations. Using this formalism we have explicitly computed and tabulated the expected first few multipole components for the γ-ray burst (GRB) distribution using a cold dark matter power spectrum. Unfortunately, our analysis leads us to expect that an anisotropy signal for this model of structure formation will be below the shot-noise level for the foreseeable future. Earlier studies by others had claimed that it may be possible within a decade or so to probe structure formation using the angular distribution of GRBs. We find that while it may be possible to probe the dipole due to our motion with respect to the cosmic rest frame, it does not seem feasible to probe the multipole components due to intrinsic fluctuations if the actual power spectrum is fixed to within an order of magnitude by the cold dark matter model of structure formation.
机译:我们给出了在给定任何特定的密度扰动功率谱的情况下,对于爆裂源计算球形谐波扩展中的多极分量所需的形式和技术。使用这种形式主义,我们已经使用冷暗物质功率谱显式计算并列出了用于γ射线猝发(GRB)分布的预期的前几个多极分量。不幸的是,我们的分析使我们预期,在可预见的将来,这种结构形成模型的各向异性信号将低于散粒噪声水平。其他人的较早研究声称,可能在十年左右的时间内使用GRB的角度分布探测结构的形成。我们发现,虽然由于我们相对于宇宙静止框架的运动而有可能探测偶极子,但如果将实际功率谱固定在一个数量级以内,则由于固有波动而探测多极子组件似乎是不可行的。量级由冷暗物质模型形成。

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