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We study the 2D Ising model in a complex magnetic field in the vicinity ofthe Yang-Lee edge singularity. By using Baxter's variational corner transfermatrix method combined with analytic techniques, we numerically calculate thescaling function and obtain an accurate estimate of the location of theYang-Lee singularity. The existing series expansions for susceptibility of the2D Ising model on a triangular lattice by Chan, Guttmann, Nickel and Perkallowed us to substantially enhance the accuracy of our calculations. Ourresults are in excellent agreement with the Ising field theory calculations byFonseca, Zamolodchikov and the recent work by Xu and Zamolodchikov. Inparticular, we numerically confirm an agreement between the leading singularbehavior of the scaling function and the predictions of the ${\mathcalM}_{2/5}$ conformal field theory.

Corner Transfer Matrix Approach to the Yang-Lee Singularity in the 2D Ising Model in a magnetic field