  We formulate a microscopic, no adjustable parameter, theory of activated
relaxation in supercooled liquids directly in terms of the repulsive and
attractive forces within the framework of pair correlations. Under isochoric
conditions, attractive forces can nonperturbatively modify slow dynamics, but
at high enough density their influence vanishes. Under isobaric conditions,
attractive forces play a minor role. High temperature apparent Arrhenius
behavior and density-temperature scaling are predicted. Our results are
consistent with recent isochoric simulations and isobaric experiments on a
deeply supercooled molecular liquid. The approach can be generalized to treat
colloidal gelation and glass melting, and other soft matter slow dynamics
problems.
