Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fermionic structure in the sine-Gordon model: form factors and
  null-vectors   The form factor bootstrap in integrable quantum field theory allows one to
capture local fields in terms of infinite sequences of Laurent polynomials
called `towers'. For the sine-Gordon model, towers are systematically described
by fermions introduced some time ago by Babelon, Bernard and Smirnov. Recently
the authors developed a new method for evaluating one-point functions of
descendant fields, using yet another fermions which act on the space of local
fields. The goal of this paper is to establish that these two fermions are one
and the same object. This opens up a way for answering the longstanding
question about how to identify precisely towers and local fields.

11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn