Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Density operators that extremize Tsallis entropy and thermal stability
  effects   Quite general, analytical (both exact and approximate) forms for discrete
probability distributions (PD's) that maximize Tsallis entropy for a fixed
variance are here investigated. They apply, for instance, in a wide variety of
scenarios in which the system is characterized by a series of discrete
eigenstates of the Hamiltonian. Using these discrete PD's as "weights" leads to
density operators of a rather general character. The present study allows one
to vividly exhibit the effects of non-extensivity. Varying Tsallis'
non-extensivity index $q$ one is seen to pass from unstable to stable systems
and even to unphysical situations of infinite energy.

12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
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The categories of this paper are: acc-phys
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The categories of this paper are: stat
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph