Assess genuineness and significance of the p=3 d-type instanton instability

Ascertain, for the p = 3 truncated single-cut saddle that remains the only self-consistent single-cut solution where the dominant saddle ceases to exist, whether the observed d-type instanton condensation constitutes a genuine instability contributing to the original path-integral contour, and, if so, characterize the physical significance of this instability in the dual gravitational description.

Background

At truncation level p = 3, the authors observe an apparent instability on the subdominant single-cut saddle against condensation of d-type instantons, including in a charge range where this saddle is the only viable single-cut description in the microcanonical ensemble.

They caution that it is not established whether this is a genuine instability that contributes to the original contour without a Lefschetz thimble analysis, and they also leave open the question of the physical meaning of such an instability if confirmed.

References

Whether it indicates a genuine instability along the saddle, i.e. whether it contributes to the original contour of integration in a way that would be revealed by a full Lefschetz thimble analysis, is left unresolved in this work, as is the question of any physical significance such an instability might carry.

Instanton condensation and a new phase of BPS black holes  (2604.00095 - Holden, 31 Mar 2026) in Section 5.3, p=3