UNIVERSALITY AND INTERFACES AT CRITICAL END-POINTS

At a critical end point a critical phase coexists with a noncritical phase ± and singularities arise beyond those on the associated critical line. New universal amplitude ratios are defined for the shape of the ±-phase boundary and for the noncritical surface tensions near end points. A postulated correspondence with wall/surface criticality leads to predictions for general dimension d that are exact at (and near) d=2 and for d 4 (where mean-field theory applies) and yield experimentally testable estimates for d=3. © 1990 The American Physical Society.