Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Connecting Solutions in Open String Field Theory with Singular Gauge
  Transformations   We show that any pair of classical solutions of open string field theory can
be related by a formal gauge transformation defined by a gauge parameter $U$
without an inverse. We investigate how this observation can be used to
construct new solutions. We find that a choice of gauge parameter consistently
generates a new solution only if the BRST charge maps the image of $U$ into
itself. When this occurs, we argue that $U$ naturally defines a star algebra
projector which describes a surface of string connecting the boundary conformal
field theories of the classical solutions related by $U$. We also note that
singular gauge transformations give the solution space of open string field
theory the structure of a category, and we comment on the physical
interpretation of this observation.

36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys