Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Phase Space Elementary Cell in Classical and Generalized Statistics   In the past, the phase-space elementary cell of a non-quantized system was
set equal to the third power of the Planck constant; in fact, it is not a
necessary assumption. We discuss how the phase space volume, the number of
states and the elementary-cell volume of a system of non-interacting N
particles, changes when an interaction is switched on and the system becomes or
evolves to a system of correlated non-Boltzmann particles and derives the
appropriate expressions. Even if we assume that nowadays the volume of the
elementary cell is equal to the cube of the Planck constant, h^3, at least for
quantum systems, we show that there is a correspondence between different
values of h in the past, with important and, in principle, measurable
cosmological and astrophysical consequences, and systems with an effective
smaller (or even larger) phase-space volume described by non-extensive
generalized statistics.

36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
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The categories of this paper are: eess