TRICRITICAL UNIVERSALITY IN A 2-DIMENSIONAL SPIN FLUID

Monte Carlo simulations are used to investigate the tricritical point properties of a two-dimensional (2D) spin fluid. Measurements of the s caling operator distributions are employed in conjunction with a finit e-size scaling analysis to locate the tricritical point and determine the directions of the relevant scaling fields and their associated tri critical exponents. The scaling operator distributions and exponents a re shown to match quantitatively those of the 2D Blume-Capel model, co nfirming that both models belong to the same universality class. Mean- field calculations of the tricritical point location are also compared with the simulation measurements.