Exact Zeros of the Partition Function for a Continuum System with Double Gaussian Peaks

Details Exact Zeros of the Partition Function for a Continuum System with Double Gaussian Peaks Exact Zeros of the Partition Function for a Continuum System with Double Gaussian Peaks

2000-01-18

arxiv.org/abs/cond-mat/0001240v2

Physics

Condensed Matter

Statistical Mechanics

13 pages, 6 figures, revtex, minor changes in fig.2, to be published in Physical Review E

Scientific paper

10.1103/PhysRevE.62.4558

We calculate the exact zeros of the partition function for a continuum system where the probability distribution for the order parameter is given by two asymmetric Gaussian peaks. When the positions of the two peaks coincide, the two separate loci of zeros which used to give first-order transition touch each other, with density of zeros vanishing at the contact point on the positive real axis. Instead of the second-order transition of Ehrenfast classification as one might naively expect, one finds a critical behavior in this limit.

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