Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Theoretical analysis of the force on the end face of a nano-filament
  exerted by an outgoing light pulse   The slight deformations observed upon transmission of a light pulse through a
short length of a silica glass nano-filament offer the possibility of
determining the momentum of light inside the filament. Using precise numerical
calculations that take into account not only the electromagnetic momentum
inside and outside the filament, but also the Lorentz force exerted by a light
pulse in its entire path through the nano-waveguide, we conclude that the net
effect of a short pulse exiting the nano-filament should be a pull force on the
end face of the filament.

13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an