2026/03/02 by Ethan Torres · 1 voice
Physics and Astronomy · #hep-th
arxiv published 2026/03/02 · arxiv updated 2026/07/09
In this note, we give a non-perturbative construction of a lightlike domain wall separating IIA and IIB string theories in 10D in the framework of discrete light-cone quantization (DLCQ). In this setting, generalizations of the BFSS conjecture relate the 10D flat space limit to matrix string theories (MSTs) for IIA and IIB. The former is equivalent to the large-N limit of 2D Super Yang-Mills theory, while the latter is the large-N limit of 3D ABJM theory with ± 1 Chern-Simons levels. Our construction requires the string coupling to vanish at the location of the wall, and we show that BPS IIA D0-branes become non-BPS IIB D0-branes as they cross it, as anticipated in \citeHeckman:2025wqd.