Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transverse confinement of waves in 3D random media   We study the transmission of a tightly focused beam through a thick slab of
3D disordered medium in the Anderson localized regime. We show that the
transverse profile of the transmitted beam exhibits clear signatures of
Anderson localization and that its mean square width provides a direct measure
of the localization length. For a short incident pulse, the width is
independent of absorption.

27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
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The categories of this paper are: solv-int
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The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
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The categories of this paper are: stat
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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph