Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gravitational collapse of a macroscopic string by a Newtonian
  description including the effect of gravitational radiation   We make an attempt to dynamically study, in four space-time dimensions, the
classical gravitational collapse of a macroscopic circular fundamental string,
by a truncation of the Einstein equations that suppresses retarded features but
keeps the main self-gravity peculiarities of the relativistic string dynamics,
and allows the investigation of a possible infinite red-shift. The numerical
solution of the string evolution in the self-induced metric shows an infinite
red shift at a macroscopic size of the string, when the string reaches the
velocity of light. We further include the back-reaction of the radiation of
gravitons which induces energy dissipation: now the velocity of light is not
reached, the infinite red-shift does not form and the string simply shrinks
with damped oscillations.

33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom