Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Investigation of the High Energy Behaviours of the Scalar Particle
  Scattering Amplitude in the Gravitational Field by Functional Approach   Closed expressions for the Green function and amplitude of the scalar
particle scattering in the external gravitational field $g_{\mu\nu}(x)$ are
found in the form of functional integrals. It is shown that, as compared with
the scattering on the vector potential, the tensor character of the
gravitational field leads to a more rapid increase of the cross section with
increasing energy. Discrete energy levels of particles are obtained in the
Newton potential.

17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph