Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Neutron-loaded outflows in gamma-ray bursts   Relativistic neutron-loaded outflows in gamma-ray bursts are studied at their
early stages, before deceleration by a surrounding medium. The outflow has four
components: radiation, electrons, protons and neutrons. The components interact
with each other and exchange energy as the outflow expands. The presence of
neutrons significantly changes the outflow evolution. Before neutrons decouple
from protons, friction between the two components increases their temperatures
by many orders of magnitude. After the decoupling, the gradual neutron decay
inside the outflow has a drag effect on the protons and reduces their final
Lorentz factor.

14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin