Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Geodesic flows and their deformations in Bertrand spacetimes   In this article we will discuss some features of a particular spacetime
called Bertrand space-time of Type II (BST-II). The talk discusses about the
energy conditions and the ESR parameters in this spacetime.

25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom