An orientifold of the solitonic fivebrane
Stefan Forste, Debashis Ghoshal, Sudhakar Panda

TL;DR
This paper investigates an orientifold of the solitonic fivebrane in type II string theory within an exact conformal field theory framework, revealing the necessity of four D-6-branes at each fixed plane for consistency.
Contribution
It provides an exact CFT analysis of the orientifold of the solitonic fivebrane and identifies the D-brane configurations required for consistency at spatial infinity.
Findings
No IR divergences in tadpole diagrams within the considered domain.
Four D-6-branes are needed at each orientifold fixed plane.
Consistency conditions emerge when extrapolating to spatial infinity.
Abstract
We study an orientifold of the solitonic fivebrane of type II string theory. The consideration is restricted to a space-time domain which can be described by an exact conformal field theory. There are no IR divergent contributions to tadpole diagrams and thus no consistency conditions arise. However, extrapolating the results to spatial infinity leads to consistency conditions implying that there are four (physical) D-6-branes sitting at each of the two orientifold fixed planes.
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