Descriptive Thermodynamics

Details Descriptive Thermodynamics Descriptive Thermodynamics

2005-10-03

arxiv.org/abs/cond-mat/0510030v2

Physics

Condensed Matter

Statistical Mechanics

Proc. 3rd Int. Conf. Sigma-Phi, Kolymbari; 8 pages, 4 figures Revised version, shortened for publication NB. The paper's auto-

Scientific paper

10.1016/j.physa.2006.01.031

Thermodynamics (in concert with its sister discipline, statistical physics) can be regarded as a data reduction scheme based on partitioning a total system into a subsystem and a bath that weakly interact with each other. The ubiquity and applicability of the scheme chiefly derives from that of partitioning protocols in experiments and observations. Whereas conventionally, the systems investigated require this form of data reduction in order to facilitate prediction, a different problem also occurs, in the context of communication networks, markets, etc. Such "empirically accessible" systems typically overwhelm observers with the sort of information that in the case of (say) a gas is effectively unobtainable. What is required for such complex interacting systems is not prediction (this may be impossible when humans besides the observer are responsible for the interactions) but rather,_description_ as a route to understanding. Still, the need for a thermodynamical data reduction scheme remains. In this paper, we show how an empirical temperature can be computed for finite, empirically accessible systems, and further outline how this construction allows the age-old science of thermodynamics to be fruitfully applied to them. The particular example of TCP/IP networks will be briefly discussed.

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