Work

A Casimir obstruction to asymptotically flat black-brane completions of non-supersymmetric 7-branes

Year: 2026

Type: article

Abstract: A bstract We study axisymmetric 7-brane solutions in the dilaton-gravity sector of 10d supergravity, including the backreaction of the Casimir energy induced by monodromies around the transverse circle. Without Casimir energy, we find that the system is analytically solvable and admits locally flat asymptotics with arbitrary deficit angles, but the corresponding solutions contain a naked singularity at finite proper distance. We investigate whether this singularity can be replaced by a regular finite-horizon black-brane core once Casimir backreaction is included. We find that, within our ansatz, Casimir backreaction obstructs an asymptotically locally flat black-brane completion of the naked 7-brane solution.

Source: Journal of High Energy Physics

DOI: 10.1007/jhep11(2026)096

Authors: Yuta Hamada, Hayate Kimura

Institutions: High Energy Accelerator Research Organization, The Graduate University for Advanced Studies, SOKENDAI, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences

Language: English

Topic: Black Holes and Theoretical Physics

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond

Funder: Japan Society for the Promotion of Science

Awards: G7169362715, G7191766382, Revealing constraints of quantum gravity on elementary particle models through classification of six-dimensional supergravity theories