Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On form factors of boundary changing operators   We develop a form factor bootstrap program to determine the matrix elements
of local, boundary condition changing operators. We propose axioms for these
form factors and determine their solutions in the free boson and Lee-Yang
models. The sudden change in the boundary condition, caused by an operator
insertion, can be interpreted as a local quench and the form factors provide
the overlap of any state before the quench with any outgoing state after the
quench.

15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th