Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Anomalous radiative trapping in laser fields of extreme intensity   We demonstrate that charged particles in a sufficiently intense standing wave
are compressed toward, and oscillate synchronously at, the maxima of the
electric field. This unusual trapping behaviour, which we call 'anomalous
radiative trapping' (ART), opens up new possibilities for the generation of
radiation and particle beams, both of which are high-energy, directed and
collimated. ART also provides a mechanism for particle control in
high-intensity QED experiments.

12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an