Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Macroscopic view of light pressure on continuous medium   The ambiguity of macroscopic description of light pressure on continuous
medium originates from the uncertainty of dividing the energy-momentum tensor
of electromagnetically excited matter into material and field parts or,
equivalently, the total acting force into pressure and deformation terms. We
show that although there exists a continuum of formally correct formulations,
one can adopt the appropriate form of the macroscopic field stress tensor that
allows unified description of pressure during elementary light-matter
interactions, such as reflection/refraction, absorption and nonlinear
conversion. The proposed expressions for the pressure force are simple,
convenient and compatible with the polariton momentum $\hbar \bf k$. The
corresponding electromagnetic momentum density (14) generalizes Rytov's
definition for right-handed and left-handed frequency dispersive media.

20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph