Vertical integration from the large Hilbert space

Abstract

Abstract:We develop an alternative description of the procedure of vertical integration based on the observation that amplitudes can be written in BRST exact form in the large Hilbert space. We relate this approach to the description of vertical integration given by Sen and Witten.

Tree-level S-matrix of superstring field theory with homotopy algebra structure

“…For closed superstring field theories, it is related to the problem of how to avoid the unphysical spurious singularities [32,50]. A consistent superstring field theory needs to be constructed to provide an algorithm that calculates the scattering amplitude as an integral over the moduli space that smoothly connects the contributions from various Feynman diagrams without hitting spurious singularities [51]. Some recent achievements [52][53][54][55][56] will help further progress.…”

Tree-level S-matrix of superstring field theory with homotopy algebra structure

“…For closed superstring field theories, it is related to the problem of how to avoid the unphysical spurious singularities [32,50]. A consistent superstring field theory needs to be constructed to provide an algorithm that calculates the scattering amplitude as an integral over the moduli space that smoothly connects the contributions from various Feynman diagrams without hitting spurious singularities [51]. Some recent achievements [52][53][54][55][56] will help further progress.…”

Mapping between Witten and lightcone string field theories

“…This is expected to be related to the issue of picture-changing operator collisions and spurious poles in covariant superstring field theories. In covariant string field theories we now have a fairly good understanding of how to deal with this problem [18,[55][56][57]. It would be very interesting if this could be translated to address the contact divergence problem in lightcone superstring field theories.…”