Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two dimensional QCD with matter in adjoint representation: What does it
  teach us?   We analyse the highly excited states in $QCD_2 (N_{c}\rightarrow\infty) $
with adjoint matter by using such general methods as dispersion relations,
duality and unitarity. We find the Hagedorn-like spectrum $\rho(m) \sim
m^{-a}\exp(\beta_H m)$ where parameters $\beta_H$ and $a$ can be expressed in
terms of asymptotics of the following matrix elements $f_{n_{\{k\}}} \sim \la
0|Tr(\bar{\Psi}\Psi)^{k}|n_{k}\ra$. We argue that the asymptotical values
$f_{n_{\{k\}}}$ do not depend on $k$ (after appropriate normalization). Thus,
we obtain $\beta_H= (2/\pi)\sqrt{\pi/g^2N_{c}}$ and $a = -3/2$ in case of
Majorana fermions in the adjoint representation. The Hagedorn temperature is
the limiting temperature in this case. We also argue that the chiral condensate
$\la 0|Tr(\bar{\Psi}\Psi) |0\ra$ is not zero in the model. Contrary to the 't
Hooft model, this condensate does not break down any continuous symmetries and
can not be considered as an order parameter. Thus, no Goldstone boson appears
as a consequence of the condensation. We also discuss a few apparently
different but actually tightly related problems: master field, condensate,
wee-partons and constituent quark model in the light cone framework.

1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat