Correlation Function at $β_t$ in the Disordered Phase of 2D Potts Models

Details Correlation Function at $β_t$ in the Disordered Phase of 2D Potts Models Correlation Function at $β_t$ in the Disordered Phase of 2D Potts Models

1994-10-26

arxiv.org/abs/hep-lat/9410019v1

Physics

High Energy Physics

High Energy Physics - Lattice

18 pages, LATEX + 7 postscript files as uuencoded compressed tar file, Mainz preprint JOGU-COMA 2/94

Scientific paper

10.1016/0375-9601(94)00904-4

We use Monte Carlo simulations to measure the spin-spin correlation function in the disordered phase of two-dimensional $q$-state Potts models with $q=10,15$, and $20$ at the first-order transition point $\beta_t$. To extract the correlation length $\xi_d$ from the exponential decay of the correlation function over several decades with the desired accuracy we make extensively use of cluster-update techniques and improved estimators. Our results for $\xi_d$ are compatible with an analytic formula. As a byproduct we also measure the energy moments in the disordered phase and find very good agreement with a recent large $q$ expansion at $\beta_t$.

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