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Large-scale structure of the Universe. Analytic theory.Lebedev Physical Institute, Russian Academy of Sciences, Leninsky prosp. 53, Moscow, 119991, Russian Federation An analytical theory is developed of the nonlinear stage of the Jeans instability in a cold nondissipative gas in an expanding Universe. It is shown that the growth of this instability creates a giant dark-matter halo, of 200 kpc size, around galaxies. This halo has a density singularity described by ρ propto r -α, where α approx
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