On the definition of temperature in FPU systems

Details On the definition of temperature in FPU systems On the definition of temperature in FPU systems

2003-11-19

arxiv.org/abs/cond-mat/0311448v1

Physics

Condensed Matter

Statistical Mechanics

12 pages, 4 Figures

Scientific paper

10.1023/B:JOSS.0000022378.52789.

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.

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