Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Constraints on the emission mechanisms of gamma-ray bursts   If the emission of gamma-ray bursts were due to the synchrotron process in
the standard internal shock scenario, then the typical observed spectrum should
have a slope F(nu) \propto nu^{-1/2}, which strongly conflicts with the much
harder spectra observed. This directly follows from the cooling time being much
shorter than the dynamical time. Particle re-acceleration, deviations from
equipartition, fastly changing magnetic fields and adiabatic losses are found
to be inadequate to account for this discrepancy. We also find that in the
internal shock scenario the relativistic inverse Compton scattering is always
as important as the synchrotron process, and faces the same problems. This
indicates that the burst emission is not produced by relativistic electrons
emitting synchrotron and inverse Compton radiation.

37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th