Renormalization schemes for SFT solutions

Understand

In this paper, we examine the space of renormalization schemes compatible with the Kiermaier and Okawa [arXiv:0707.4472] framework for constructing Open String Field Theory solutions based on marginal operators with singular self-OPEs.

• We show that, due to freedom in defining the renormalization scheme which tames these singular OPEs, the solutions obtained from the KO framework are not necessarily unique.
• We identify a multidimensional space of SFT solutions corresponding to a single given marginal operator.