Open string field theory without open strings
arXiv:hep-th/0103085 · doi:10.1016/S0370-2693(01)00673-6
Abstract
Witten's cubic open string field theory is expanded around the perturbatively stable vacuum, including all scalar fields at levels 0, 2, 4 and 6. The (approximate) BRST cohomology of the theory is computed, giving strong evidence for the absence of physical open string states in this vacuum.
12 pages, 1 figure, LaTeX; v2: reference added