Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Zitterbewegung and gravitational Berry phase   Berry phases mix states of positive and negative energy in the propagation of
fermions and bosons in external gravitational and electromagnetic fields and
generate Zitterbewegung oscillations. The results are valid in any reference
frame and to any order of approximation in the metric deviation.

29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs