Condensed Matter Physics, 2005, vol. 8, No. 4(44), p. 655664, English
DOI:10.5488/CMP.8.4.655
Title:
The concept of entropy. Relation between action and entropy
Author(s):
 J.P.Badiali
(LECA, ENSCPUniversité Pierre et Marie Curie,
4 Place Jussieu, 75230 Paris Cedex 05, France)
,

The Boltzmann expression for entropy represents the traditional
link between thermodynamics and statistical mechanics. New
theoretical developments like the Unruh effect or the black hole
theory suggest a new definition of entropy. In this paper we
consider the thermodynamics of black holes as seriously founded
and we try to see what we can learn from it in the case of
ordinary systems for which a prerelativistic description is
sufficient. We introduce a spacetime model and a new definition
of entropy considering the thermal equilibrium from a dynamic
point of view. Then we show that for black hole and ordinary
systems we have the same relation relating a change of entropy to
a change of action.
Key words:
thermodynamics, entropy
PACS:
03.65.Ca, 05.30.d, 05.70.a, 47.53.+n
