天文學中,相關函數(一般指兩點相關函數,英語:Two-point correlation function)通常用來描述宇宙星系的分佈。兩點相關函數是關於兩個星系之間的距離概率分佈。它可以作為描述星系成團性的參數——如果在某個距離下該函數的值越大,表示宇宙在相應尺度下更加成團。[1][2]

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