Summary
General expressions for small fluctuations are obtained for the case of macroscopic quantitiesQ relative to a system composed bys weakly interacting gases, when one knows the values taken by certain macroscopic constants of motionK. BothQ andK are assumed to have the form{ie463-01}, where φij is an arbitrary function of the co-ordinates and momentum and ϱj is the particle density of thej-th gas in the system. A geometrical interpretation for the results obtained is also discussed.
Riassunto
Si ottengono delle espressioni generali per piccole fluttuazioni nel caso di quantifia macroscopiche Q relative a un sistema composto da s gas debolmente interagenti, un a volta noti i valori assunti da certe costanti di moto macroscopiche K. Si fa l’ipotesi ehe tanto Q die K siano della forma {ie473-01}, dove φij è una funzione arbitraria delle coordinate e dell’impulso e ϱj è la densità di particelle del gas j-esimo nel sistema. Si discute inoltre un’interpretazione geometrica dei risultati.
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This work was performed during the author’s stay at Escola de Engenharia de S. Carlos, Universidade de S. Paulo.
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da Costa, B.C.T. On fluctuations in statistical mechanics — II. Nuovo Cim 37, 463–473 (1965). https://doi.org/10.1007/BF02749849
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DOI: https://doi.org/10.1007/BF02749849