Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generalizations of Quantum Mechanics   We review realistic models that reproduce quantum theory in some limit and
yield potentially new physics outside that limit. In particular, we consider
deterministic hidden-variables theories (such as the pilot-wave model) and
their extension to 'quantum nonequilibrium', and we consider the continuous
spontaneous localization model of wave function collapse. Other models are
briefly discussed.

23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph