Phase transition in fluctuating branched geometry

Details Phase transition in fluctuating branched geometry Phase transition in fluctuating branched geometry

1996-05-16

arxiv.org/abs/hep-lat/9605020v1

Phys.Lett. B384 (1996) 75-80

Physics

High Energy Physics

High Energy Physics - Lattice

11 pages, requires Latex2e + psfrag.sty (supplied) + elsart.cls (supplied). 3 figures included as eps files

Scientific paper

10.1016/0370-2693(96)00795-2

We study grand--canonical and canonical properties of the model of branched polymers proposed in \cite{adfo}. We show that the model has a fourth order phase transition and calculate critical exponents. At the transition the exponent $\gamma$ of the grand-canonical ensemble, analogous to the string susceptibility exponent of surface models, $\gamma \sim 0.3237525...$ is the first known example of positive $\gamma$ which is not of the form $1/n,\, n=2,3,\ldots$. We show that a slight modification of the model produces a continuos spectrum of $\gamma$'s in the range $(0,1/2]$ and changes the order of the transition.

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