Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The present situation in quantum theory and its merging with general
  relativity   We discuss the problems of quantum theory (QT) complicating its merging with
general relativity (GR). QT is treated as a general theory of micro-phenomena -
a bunch of models. Quantum mechanics (QM) and quantum field theory (QFT) are
the most widely known (but, e.g., Bohmian mechanics is also a part of QT). The
basic problems of QM and QFT are considered in interrelation. For QM, we stress
its nonrelativistic character and the presence of spooky action at a distance.
For QFT, we highlight the old problem of infinities. And this is the main point
of the paper: it is meaningless to try to unify QFT so heavily suffering of
infinities with GR. We also highlight difficulties of the QFT-treatment of
entanglement. We compare the QFT and QM based measurement theories by
presenting both theoretical and experimental viewpoints. Then we discuss two
basic mathematical constraints of both QM and QFT, namely, the use of real
(and, hence, complex) numbers and the Hilbert state space. We briefly present
non-Archimedean and non-Hilbertian approaches to QT and their consequences.
Finally, we claim that, in spite of the Bell theorem, it is still possible to
treat quantum phenomena on the basis of a classical-like causal theory. We
present a random field model generating the QM and QFT formalisms. This
emergence viewpoint can serve as the basis for unification of novel QT (may be
totally different from presently powerful QM and QFT) and general relativity
GR. (It may happen that the latter would also be revolutionary modified.)

18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn