The equilibrium entropy of a small subsystem is ln d_A minus a 1/N^2 correction set by c^2 tr(X_A^2), where c and X_A are built from Hamiltonian moments and the initial energy spread.
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Entropy of small subsystems in thermalizing systems
The equilibrium entropy of a small subsystem is ln d_A minus a 1/N^2 correction set by c^2 tr(X_A^2), where c and X_A are built from Hamiltonian moments and the initial energy spread.