Ultimate fate of the singularity in the AdS5×S5 Gubser flow

Determine whether the singularity in the ten-dimensional type IIB AdS5×S5 "Gubser flow" with a running dilaton admits a consistent ultraviolet completion or resolution, thereby establishing whether it should be regarded as a physically acceptable singularity.

Background

The Gubser flow is a moduli-space flow in AdS5×S5 with running dilaton that satisfies the Maldacena–Nuñez criterion but cannot be cloaked by a near-extremal horizon. This places it outside Gubser’s horizon test while not obviously violating other diagnostics.

The authors emphasize that, despite passing known geometric tests, the status of this singularity is unresolved and requires further clarification regarding its UV completion or physical admissibility.