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>Intermittency and Large-Scale Structure in the Universe: A New Window for the Study of the Nonlinear Regime of Structure Formation
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Intermittency and Large-Scale Structure in the Universe: A New Window for the Study of the Nonlinear Regime of Structure Formation
We study the weak nonlinear regime of structure formation using high resolution and high signal-to-noise ratio (S/N) samples of Quasi Stellar Objects' (QSOs) Lyα transmission spectra. Using a space-scale decomposition, the Discrete Wavelet Transform (DWT), we show that the field traced by Lyα transmission flux is intermittent on scales less than 2000 km/s. The distribution of the local power of fluctuations is spiky with almost no power between the spikes. This spike-gapspike feature gets more pronounced on smaller scales (128-16 km/s). We show that the structure functions and the intermittent exponent are not only able to quantitatively differentiate between different dark matter models but also qualitatively describe the nature of non-Gaussianity. Structure functions and the intermittent exponent are powerful tools for describing an intermittent field.
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机译:我们使用高分辨率和高信噪比(QSOS)LYα传输光谱的高分辨率和高信噪比(S / N)样本来研究结构形成的弱非线性制度。使用空格分解,离散小波变换(DWT),我们表明Lyα传输通量跟踪的字段在小于2000 km / s的尺度上间歇性。当地波动的分布是尖峰的尖峰,尖峰之间几乎没有任何力量。此Spike-Pappike功能在较小的尺度上更加明显(128-16 km / s)。我们表明结构功能和间歇性指数不仅能够在不同的暗物质模型之间定量区分,而且可以定性地描述非高斯的性质。结构功能和间歇指数是用于描述间歇性字段的强大工具。
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