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arXiv 0811.2223astro-ph
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星系际介质中的原初非高斯性

Primordial non-Gaussianities in the Intergalactic Medium

M. Viel, E. Branchini, K. Dolag, M. Grossi, S. Matarrese, L. Moscardini

备注：
10 pages, 7 figures. Accepted for publication in MNRAS
发表信息：
Mon.Not.Roy.Astron.Soc.393:774-782,2009
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摘要：

我们目前的结果，从第一个高分辨率的非高斯宇宙模型的流体动力学模拟。我们着重研究高红移星系际介质中透射莱曼α通量的统计特性。非高斯性的印记是存在的，并且在高红移时更大。当与f_NL=0的标准LCDM宇宙学相比时，对于非线性参数f_NL= \pm 100的值，预计在z>3处，高透射率区域（空隙）的通量概率分布函数的差异大于20%。我们还研究了一维通量双谱：在最大尺度（对应于数十Mpc），我们预计在z~4处（f_NL= \pm 100）通量双谱的偏差高达20%，明显大于通量功率谱的偏差~ 3%。我们简要地讨论可能的系统误差，可以污染的信号。虽然具有挑战性，但在莱曼-阿尔法森林探测的有趣的尺度和红移制度中检测非高斯性是可能的。

英文摘要：

We present results from the first high-resolution hydrodynamical simulations of non-Gaussian cosmological models. We focus on the statistical properties of the transmitted Lyman-alpha flux in the high redshift intergalactic medium. Imprints of non-Gaussianity are present and are larger at high redshifts. Differences larger than 20 % at z>3 in the flux probability distribution function for high transmissivity regions (voids) are expected for values of the non linearity parameter f_NL=\pm 100 when compared to a standard LCDM cosmology with f_NL=0. We investigate also the one-dimensional flux bispectrum: at the largest scales (corresponding to tens of Mpc) we expect deviations in the flux bispectrum up to 20% at z~4 (for f_NL=\pm 100), significantly larger than deviations of ~ 3% in the flux power spectrum. We briefly discuss possible systematic errors that can contaminate the signal. Although challenging, a detection of non-Gaussianities in the interesting regime of scales and redshifts probed by the Lyman-alpha forest, could be possible with future data sets.

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