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We study, using both theory and simulations, a system of self‐gravitating sheets. A new statistical mechanics theory – free of any adjustable parameters is derived to quantitatively predict the final stationary state achieved by this system after the process of collisionless relaxation is completed. The theory shows a very good agreement with the numerical simulations. The model sheds new light on the general mechanism of relaxation of self‐gravitating systems and may help us to understand cold matter distribution in the Universe.

Statistical mechanics of 1D self‐gravitating systems: the core–halo distribution