Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Irreversibility in Collapse-Free Quantum Dynamics and the Second Law of
  Thermodynamics   Proposals to solve the problems of quantum measurement via non-linear
CPT-violating modifications of quantum dynamics are argued to provide a
possible fundamental explanation for the irreversibility of statistical
mechanics as well. The argument is expressed in terms of collapse-free
accounts. The reverse picture, in which statistical irreversibility generates
quantum irreversibility, is argued to be less satisfactory because it leaves
the Born probability rule unexplained.

12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics