Identity of the universal repulsive-core singularity with Yang-Lee edge criticality.
Lattice and continuum fluid models with repulsive-core interactions typically display a dominant, critical-type singularity on the real, negative activity axis. Lai and Fisher recently suggested, mainly on numerical grounds, that this repulsive-core singularity is universal and in the same class as the Yang-Lee edge singularities, which arise above criticality at complex activities with positive real part. A general analytic demonstration of this identification is presented here using a field-theory approach with separate representations of the repulsive and attractive parts of the pair interactions.
Park
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Institute for Physical Science and Technology, University of Maryland, College Park, Maryland 20742, USA.
Fisher
M E
ME