Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Microscopic statistical basis of classical Thermodynamics of finite
  systems   Heat can flow from cold to hot at any phase separation. Therefore
Lynden-Bell's gravo-thermal catastrophe must be reconsidered. The original
objects of Thermodynamics, the separation of phases at first order phase
transitions, like boiling water in steam engines, are not described by a single
canonical ensemble. Inter-phase fluctuations are not covered. The basic
principles of statistical mechanics, especially of phase transitions have to be
reconsidered without the use of the thermodynamic limit. Then thermo-statistics
applies also to nuclei and large astronomical systems. A lot of similarity
exists between the accessible phase space of fragmenting nuclei and
inhomogeneous multi stellar systems.

22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph