4 papers
Gravitational electric-magnetic duality at the light ring and quasinormal mode isospectrality in effective field theories
Ibrahima Bah, Emanuele Berti, Valerio De Luca +2
Black hole perturbations are characterized by a superposition of damped exponentials known as quasinormal modes. In general relativity, the spectra of parity-even and parity-odd qu…
Non-Abelian Symmetry Operators from Hanging Branes in
Ibrahima Bah, Federico Bonetti, Mufaro Chitoto +1
We investigate the holographic realization of topological operators for continuous non-Abelian symmetries in quantum field theories. As a concrete case study, we focus on Type IIB…
Symmetry Operators and Gravity
Ibrahima Bah, Patrick Jefferson, Konstantinos Roumpedakis +1
We argue that topological operators for continuous symmetries written in terms of currents need regularization, which effectively gives them a small but finite width. The regulated…
On the Physics of Higher Condensation Defects
Ibrahima Bah, Enoch Leung, Thomas Waddleton
We study the structure of topological defects for finite Abelian symmetries in quantum field theories, and argue on physical grounds that they satisfy the definition of a higher fu…