Cogito, ergo-strings: supersymmetric ergoregions and their stringy excitations
Cogito, ergo-strings: supersymmetric ergoregions and their stringy excitations
Supergravity solutions describing supersymmetric rotating bound states of NS fivebranes, fundamental strings and momentum can sometimes have an ergoregion but no horizon. In such supersymmetric ergoregions, there is an unusual feature that there exist BPS “excitations” that cost negative (or zero) energy as measured from asymptotic infinity. We study the spectrum of supergravity and string excitations of these backgrounds using their worldsheet description as gauged Wess-Zumino-Witten (WZW) models, and construct their holographic map to transitions in the dual spacetime CFT. The backgrounds generically contain orbifold singularities, and we exhibit vertex operators corresponding to twisted sector ground states localized at the orbifold fixed points. The gauged WZW model thus provides a valuable tool to explore the stringy structure of such heavy BPS states in AdS
3/CFT
2.
AdS-CFT Correspondence, Black Holes in String Theory
Martinec, Emil J.
650e0325-0c1c-4177-9475-4eaaf978cca8
Massai, Stefano
1ea199a1-6815-405e-a9f0-efadbbc15f48
Turton, David
6ce84b30-3cc0-42aa-ace5-f298d4260e9b
5 January 2026
Martinec, Emil J.
650e0325-0c1c-4177-9475-4eaaf978cca8
Massai, Stefano
1ea199a1-6815-405e-a9f0-efadbbc15f48
Turton, David
6ce84b30-3cc0-42aa-ace5-f298d4260e9b
Martinec, Emil J., Massai, Stefano and Turton, David
(2026)
Cogito, ergo-strings: supersymmetric ergoregions and their stringy excitations.
Journal of High Energy Physics, 2026 (1), [34].
(doi:10.1007/JHEP01(2026)034).
Abstract
Supergravity solutions describing supersymmetric rotating bound states of NS fivebranes, fundamental strings and momentum can sometimes have an ergoregion but no horizon. In such supersymmetric ergoregions, there is an unusual feature that there exist BPS “excitations” that cost negative (or zero) energy as measured from asymptotic infinity. We study the spectrum of supergravity and string excitations of these backgrounds using their worldsheet description as gauged Wess-Zumino-Witten (WZW) models, and construct their holographic map to transitions in the dual spacetime CFT. The backgrounds generically contain orbifold singularities, and we exhibit vertex operators corresponding to twisted sector ground states localized at the orbifold fixed points. The gauged WZW model thus provides a valuable tool to explore the stringy structure of such heavy BPS states in AdS
3/CFT
2.
Text
JHEP01(2026)034
- Version of Record
More information
Accepted/In Press date: 5 November 2025
Published date: 5 January 2026
Additional Information:
Publisher Copyright:
© The Author(s) 2026.
Keywords:
AdS-CFT Correspondence, Black Holes in String Theory
Identifiers
Local EPrints ID: 508839
URI: http://eprints.soton.ac.uk/id/eprint/508839
ISSN: 1126-6708
PURE UUID: db3759fb-2ea6-4dee-918a-a2b7c977f8e2
Catalogue record
Date deposited: 04 Feb 2026 17:45
Last modified: 05 Feb 2026 02:53
Export record
Altmetrics
Contributors
Author:
Emil J. Martinec
Author:
Stefano Massai
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics
