Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Yang--Mills Glueballs as Closed Bosonic Strings   We put forward the Axionic String Ansatz (ASA), which provides a unified
description for the worldsheet dynamics of confining strings in pure
Yang--Mills theory both in $D=3$ and $D=4$ space-time dimensions. The ASA is
motivated by the excitation spectrum of long confining strings, as measured on
a lattice, and by recently constructed integrable axionic non-critical string
models. According to the ASA, pure gluodynamics in 3D is described by a
non-critical bosonic string theory without any extra local worldsheet degrees
of freedom. We argue that this assumption fixes the set of quantum numbers
(spins, $P$- and $C$-parities) of almost all glueball states. We confront the
resulting predictions with the properties of approximately $1^2+2^2+3^2+5^2=39$
lightest glueball states measured on a lattice and find a good agreement. On
the other hand, the spectrum of low lying glueballs in 4D gluodynamics suggests
the presence of a massive pseudoscalar mode on the string worldsheet, in
agreement with the ASA and lattice data for long strings.

28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
2
The categories of this paper are: math