Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Matter waves in terms of the unitary representations of the Lorentz
  group   In a generalized Heisenberg/Schroedinger picture, the unitary representations
of the Lorentz group may, for a massive relativistic particle, be used to
attribute to waves an extra wavelength that is longer than the de Broglie
wavelength. Propagators are defined as spacetime transitions between states
with different eigenvalues of the first or the second Casimir operator of the
Lorentz algebra.

36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph