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Jaeyoung Sung (Dept. Chemistry, Chung-Ang University) We report that an external field can drive inherently extensive systems into nonextensive ones. For the correct grand-canonical description of nonextensive systems, it is necessary to take into account the excess grand potential, , in addition to the conventional grand potential proportional to the thermodynamic pressure. We present the statistical mechanical expression for of a system as a functional of the external field imposed on the system, from which we establish the criterion for the external field that drives an inherently extensive macroscopic system into a nonextensive one. Time permitted, we will also discuss other topics such as a reaction event counting statistics for single molecule reactions, and the validity condition of Jarzynski's equality for quantum mechanical processes. |