Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On optical forces in spherical whispering gallery mode resonators   In this paper we discuss the force exerted by the field of an optical cavity
on a polarizable dipole. We show that the modification of the cavity modes due
to interaction with the dipole significantly alters the properties of the
force. In particular, all components of the force are found to be
non-conservative, and cannot, therefore, be derived from a potential energy. We
also suggest a simple generalization of the standard formulas for the optical
force on the dipole, which reproduces the results of calculations based on the
Maxwell stress tensor.

15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph