Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the existence of finite-energy lumps in classic field theories   We show how the existence of non-trivial finite-energy time-dependent
classical lumps is restricted by a generalized virial theorem. For simple model
Lagrangians, bounds on energies follow.

29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs