  We propose an interacting lattice gas model of structural glass characterized
by particle distinguishability and site-particle-dependent random
nearest-neighboring particle interactions. This incorporates disorder quenched
in the configuration space rather than in the physical space. The model
exhibits non-trivial energetics while still admitting exact equilibrium states
directly constructible at arbitrary temperature and density. The dynamics is
defined by activated hopping following standard kinetic Monte Carlo approach
without explicit facilitation rule. Kinetic simulations show emergent dynamic
facilitation behaviors in the glassy phase in which motions of individual voids
are significant only when accelerated by other voids nearby. This provides a
microscopic justification for the dynamic facilitation picture of structural
glass.
