A. Carati, P. Cipriani, L. Galgani
Published 2003-11-19Version 1
It is usually assumed, in classical statistical mechanics, that the temperature should coincide, apart from a suitable constant factor, with the mean kinetic energy of the particles. We show that this is not the case for \FPU systems, in conditions in which energy equipartition between the modes is not attained. We find that the temperature should be rather identified with the mean value of the energy of the low frequency modes.
Comments: 12 pages, 4 Figures
On the definition of temperature using time--averages
Extending the definition of entropy to nonequilibrium steady states
Non-additivity of Tsallis entropies and fluctuations of temperature
