11 papers
Love at the String Scale: Tidal Deformability Across the Black Hole-String Transition
Roberto Emparan, Luis Lehner, Stefano Trezzi
Tidal deformability provides a sensitive probe of the structure of compact objects, and black holes are exceptional in having vanishing static Love numbers in four-dimensional Eins…
Black Hole Ringdown Nonlinearities in the Large-D Limit
Roberto Emparan, Amanda Green-Salinas, David Pereñiguez +1
We initiate the study of nonlinear effects in the ringdown phase of black hole mergers using the effective theory of black hole dynamics in the large-D limit. This framework offers…
General Effective Theories of Black Holes in the Large D Limit
Roberto Emparan, Jordi Rafecas-Ventosa, Benson Way
We derive the general form of the effective equations governing black hole dynamics in the limit of a large number of dimensions . These split into a universal \emph{soap-bubble…
Branes and Antibranes in AdS: The Impossible States in the CFT Gap
Roberto Emparan, Pierre Heidmann
We construct a new family of type IIB supergravity solutions corresponding to states of the D1-D5-P-KKm system that carry the same charges and energy as the non-extremal four-charg…
Novel black saddles for 5d gravitational indices and the index enigma
Jan Boruch, Roberto Emparan, Luca V. Iliesiu +1
We construct a series of novel Euclidean multi-black-hole, black ring, black Saturn, and black lens solutions to supergravity that contribute as saddle-points to the grav…
Quantum Transparency of Near-extremal Black Holes
Roberto Emparan, Stefano Trezzi
We investigate the scattering of electromagnetic and gravitational waves off a Reissner-Nordström black hole in the low-temperature regime where the near-horizon throat experience…