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• W2088090175 abstract "We discuss the statistical mechanics of a system of self-gravitating particles with an exclusion constraint in position space in a space of dimension $d$. The exclusion constraint puts an upper bound on the density of the system and can stabilize it against gravitational collapse. We plot the caloric curves giving the temperature as a function of the energy and investigate the nature of phase transitions as a function of the size of the system and of the dimension of space in both microcanonical and canonical ensembles. We consider stable and metastable states and emphasize the importance of the latter for systems with long-range interactions. For $dle 2$, there is no phase transition. For $d>2$, phase transitions can take place between a gaseous phase unaffected by the exclusion constraint and a condensed phase dominated by this constraint. The condensed configurations have a core-halo structure made of a rocky core surrounded by an atmosphere, similar to a giant gaseous planet. For large systems there exist microcanonical and canonical first order phase transitions. For intermediate systems, only canonical first order phase transitions are present. For small systems there is no phase transition at all. As a result, the phase diagram exhibits two critical points, one in each ensemble. There also exist a region of negative specific heats and a situation of ensemble inequivalence for sufficiently large systems. By a proper interpretation of the parameters, our results have application for the chemotaxis of bacterial populations in biology described by a generalized Keller-Segel model including an exclusion constraint in position space. They also describe colloids at a fluid interface driven by attractive capillary interactions when there is an excluded volume around the particles. Connexions with two-dimensional turbulence are also mentioned." @default.
• W2088090175 created "2016-06-24" @default.
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• W2088090175 date "2014-01-01" @default.
• W2088090175 modified "2023-10-02" @default.
• W2088090175 title "Gravitational phase transitions with an exclusion constraint in position space" @default.
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• W2088090175 doi "https://doi.org/10.1140/epjb/e2013-40833-4" @default.
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