Vacuum Values for Auxiliary String Fields
arXiv:hep-th/9404166 · doi:10.1016/0370-2693(94)91259-9
Abstract
Auxiliary string fields are introduced in light-cone gauge string field theory in order to express contact interactions as contractions of cubic vertices. The auxiliary field in the purely closed-string bosonic theory may be given a non-zero expectation value, leading to a phase in which world-sheets have boundaries.
13 pages, DAMTP/94-25