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Description:
We consider the non-relativistic Hartree model in the gravitational case, i.e.~with attractive Coulomb-Newton interaction. For a given mass $M>0$, we construct stationary states with non-zero temperature $T$ by minimizing the corresponding free energy functional. It is proved that minimizers exist if and only if the temperature of the system is below a certain threshold $T^*>0$ (possibly infinite), which itself depends on the specific choice of the entropy functional. We also investigate whether the corresponding minimizers are mixed or pure quantum states and characterize a critical temperature $T_c \in (0, T^*)$ above which mixed states appear.