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 Fermi–Pasta–Ulam 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.

On the definition of temperature in FPU systems / A. Carati, P. Cipriani, L. Galgani. - In: JOURNAL OF STATISTICAL PHYSICS. - ISSN 0022-4715. - 115:3-4(2004), pp. 1101-1112.

On the definition of temperature in FPU systems

A. Carati
Primo
;
L. Galgani
Ultimo
2004

Abstract

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 Fermi–Pasta–Ulam 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.
FPU; specific heat; nonequilibrium; glasses
Settore MAT/07 - Fisica Matematica
http://springerlink.metapress.com/content/u071073848n83642/?p=db71045ba0244ec2bc4706504951ba95&pi=15
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/27993
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