We prove that a non-flat S-unimodal map satisfying a weak summability condition has exponential return time statistics on intervals around a.e. point. Moreover we prove that the convergence to the entropy in the Ornstein-Weiss formula enjoys normal fluctuations.
PHYMAT, Université de Toulon, Centre de Physique Théorique, et FRUMAM, Fédération de Recherche des Unités, de Mathématiques de Marseille, CNRS Luminy, Case 907, F-13288 Marseille Cedex 9, France