Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electromagnetic fields from quantum sources in heavy-ion collisions   We compute the electromagnetic field created by an ultrarelativistic charged
particle in vacuum at distances comparable to the particle Compton wavelength.
The wave function of the particle is governed by the Klein-Gordon equation, for
a scalar particle, or the Dirac equation, for a spin-half particle. The
produced electromagnetic field is essentially different in magnitude and
direction from the Coulomb field, induced by a classical point charge, due to
the quantum diffusion effect. Thus, a realistic computation of the
electromagnetic field produced in heavy-ion collisions must be based upon the
full quantum treatment of the valence quarks.

15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
1
The categories of this paper are: cs