The exact rate of convergence of the Lq-spectra of self-similar measures for q <0

The Lq -spectrum of a Borel measure is one of the key objects in multifractal analysis, and it is widely believed that Lq - spectrum associated with a fractal measure encode important information about the underlying dynamics and geometry. The study of the Lq -spectrum therefore plays a fundamental role in the understanding of dynamical systems or fractal measures. For q 0 Olsen [L. Olsen, Empirical multifractal moment measures and moment scaling functions of self-similar multifractals, Math. Proc. Cambridge Philos. Soc. 133 (2002) 459–485] recently determined the exact rate of convergence of the Lq -spectra of a self-similar measure satisfying the Open Set Condition (OSC). Unfortunately, nothing is known about the rate of convergence for q < 0. Indeed, the problem of analysing Lq -spectra for q <0 is generally considered significantly more difficult since the Lq -spectra are extremely sensitive to small variations in the distribution of μ for q <0. The purpose of this paper is to overcome these obstacles and to investigate the more difficult problem of determining the exact rate of convergence of the multifractal Lq -spectra of a self-similar measure satisfying the OSC for q <0. © 2007 Elsevier Inc. All rights reserved.