The advent of gravitational waves and black hole imaging has opened a new window into
probing the horizon scale of black holes. An important question is whether string theory …

Abstract The LIGO and Virgo Interferometers have so far provided 11 gravitational-wave
(GW) observations of black-hole binaries. Similar detections are bound to become very …

The black-hole information paradox provides one of the sharpest foci for the conflict between
quantum mechanics and general relativity and has become the proving-ground of would-be …

This is a review on brane effective actions, their symmetries and some of their applications.
Its first part covers the Green-Schwarz formulation of single M-and D-brane effective actions …

A bstract We construct a family of non-supersymmetric extremal black holes and their
horizonless microstate geometries in four dimensions. The black holes can have finite …

We investigate whether photon ring observations in black hole imaging are able to
distinguish between the Kerr black hole in general relativity and alternative black holes that …

We describe and study families of BPS microstate geometries, namely, smooth, horizonless
asymptotically flat solutions to supergravity. We examine these solutions from the …

A bstract We explain in detail how to calculate the gravitational mass and angular
momentum multipoles of the most general non-extremal four-dimensional black hole with …

We give a broad conceptual review of what we have learned about black holes and their
microstate structure from the study of microstate geometries and their string theory limits. We …

A bstract We analyze stationary BPS black hole solutions to 4d\(\mathcal {N}\)= 2 abelian
gauged supergravity. Using an appropriate near horizon ansatz, we construct rotating …