Nonlinear extensions of gravitating dyons: from NUT wormholes to Taub-Bolt instantons

Recent work has shown the existence of a unique nonlinear extension of electromagnetism which preserves conformal symmetry and allows for the freedom of duality rotations. Moreover, black holes and gravitational waves have been found to exist in this nonlinearly extended electrovacuum. We generalise these dyonic black holes in two major ways: with the relaxation of their horizon topology and with the inclusion of magnetic mass. Motivated by recent attention to traversable wormholes, we use this new family of Taub-NUT spaces to construct AdS wormholes. We explore some thermodynamic features by using a semi-classical approach. Our results show that a phase transition between the nut and bolt configurations arises in a similar way to the Maxwellian case.

Automated summary

Recent research has uncovered a unique nonlinear extension of electromagnetism that maintains conformal symmetry and allows for duality rotations, leading to the discovery of black holes and gravitational waves. The study extends dyonic black holes by relaxing their horizon topology and incorporating magnetic mass. Inspired by traversable wormholes, a new family of Taub-NUT spaces is used to construct AdS wormholes, with thermodynamic features explored using a semiclassical approach. Results indicate a phase transition between nut and bolt configurations similar to the Maxwellian case.