Abstract
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.
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Erler, T., Maccaferri, C. Connecting solutions in open string field theory with singular gauge transformations. J. High Energ. Phys. 2012, 107 (2012). https://doi.org/10.1007/JHEP04(2012)107
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DOI: https://doi.org/10.1007/JHEP04(2012)107