We present a theoretical study of capillary condensation of fluids adsorbedin mesoporous disordered media. Combining mean-field density functional theorywith a coarse-grained description in terms of a lattice-gas model allows us toinvestigate both the out-of-equilibrium (hysteresis) and the equilibriumbehavior. We show that the main features of capillary condensation indisordered solids result from the appearance of a complex free-energy landscapewith a large number of metastable states. We detail the numerical proceduresfor finding these states, and the presence or absence of transitions in thethermodynamic limit is determined by careful finite-size studies.
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