Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Propagation of an ultrashort electromagnetic pulse in solid-state plasma   The change of the shape of an ultrashort electromagnetic pulse in its
propagation in solid-state plasma was calculated in the linear approximation. A
case of solid-state silver plasma and of a "Mexican hat" wavelet pulse was
considered. The dielectric permittivity of the medium was calculated in the
Drude model. Strong dispersion spreading of a pulse at distances of the order
of several microns was shown, and the comparison of evolution of the pulse
shape for different center frequencies was carried out.

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The categories of this paper are: astro-ph
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The categories of this paper are: nlin
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The categories of this paper are: stat
5
The categories of this paper are: gr-qc
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The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
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The categories of this paper are: cond-mat
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The categories of this paper are: patt-sol
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The categories of this paper are: alg-geom
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The categories of this paper are: quant-ph
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The categories of this paper are: supr-con
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The categories of this paper are: cmp-lg
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The categories of this paper are: econ
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The categories of this paper are: hep-lat