An early (and influential) scaling relation in the multifractal theory of Diffusion Limited Aggregation(DLA) is the Turkevich-Scher conjecture that relates the exponent \alpha_{ min} that characterizes the ``hottest'' region of the harmonic measure and the fractal dimension D of the cluster, i.e. D=1+\alpha_{ min}. Due to lack of accurate direct measurements of both D and \alpha_{ min} this conjecture could never be put to serious test. Using the method of iterated conformal maps D was recently determined as D=1.713+-0.003. In this Letter we determine \alpha_{ min} accurately, with the result \alpha_{ min}=0.665+-0.004. We thus conclude that the Turkevich-Scher conjecture is incorrect for DLA.
Categories: cond-mat.stat-mech cond-mat.dis-nn