Near Horizon Geometry of Strings Ending on Intersecting D8/D4-branes
John Estes, Darya Krym, Bert Van Pol

TL;DR
This paper classifies solutions in massive IIA supergravity for intersecting D8/D4-branes with fundamental strings, revealing new geometries and showing the absence of certain lower-dimensional CFT solutions.
Contribution
It provides a detailed analysis of BPS solutions with specific symmetries, identifying novel configurations of strings ending on D8-branes and O8-planes, and clarifies the landscape of possible near-horizon geometries.
Findings
Only the $AdS_6$ geometry with enhanced symmetry is found.
Novel solutions for strings ending on D8-branes and O8-planes are identified.
No solutions corresponding to 1+0-dimensional CFTs are found.
Abstract
We consider solutions of massive IIA supergravity corresponding to the half-BPS intersection of D8/D4-branes with fundamental strings. The -dimensional intersection preserves the symmetry . We give a reduction and partial integration of the BPS equations for this symmetry group. We then specialize to the cases of enhanced supersymmetry corresponding to or . In the first case, we show that the only solution with enhanced symmetry is given by the geometry describing the near horizon geometry of D8/D4-branes in the presence of an O8-plane. In the second case, we identify novel solutions corresponding to fundamental strings ending on D8-branes and a second set of novel solutions corresponding to fundamental strings ending on an O8-plane. In both cases, the fundamental string geometry contains an asymptotically flat…
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