Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Internal shocks in blazar jets   The discovery of strong gamma-ray and hard X-ray emission and the results
from various multifrequency campaigns have disclosed new aspects of the blazar
phenomenology, leading to a much more robust understanding of the mechanisms
underlying their emission, and offering clues for the energetics of their
relativistic jets. I review these aspects, and propose that all the diversity
in the blazar phenomenology depends on only one parameter. I also suggest that
some of the blazar characteristics can be explained by the internal shock
scenario, as proposed to explain the emission from gamma-ray bursts.

28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th