Strong Gravity News & Events

We compute gravitational mass and angular momentum multipole moments for four-dimensional black holes and fuzzball geometries thereof. For Kerr and for supersymmetric black holes many multipole moments vanish, but we show that an infinite number of ratios of vanishing multipoles are constant.

Pre-recorded seminar video, part of the computational Imaging SPACE Webinar Series (available on youtube).

The event horizons of stationary black holes are marginally outer trapped surface (MOTS). For dynamical spacetimes numerical relativists continue to track these surfaces as proxies for black hole boundaries. In this talk I will review recent (and ongoing) analytical and numerical work on MOTS.

Stellar Compact object mergers are not only important sources of gravitational waves but also central engines that power electromagnetic transients and r-processes, if matter is involved. I will review recent progress modeling the merger of black hole-neutron star and neutron stars binaries highlighting state-of-the-art general relativistic hydrodynamic simulations.

A novel approach in constructing deviations of the Kerr spacetime whereas
the symmetries can be preserved is presented. The method was applied
trivially in all known classical black-hole spacetimes tested, while
provides the possibility of testing and inventing deformations of Kerr in
a quick and innovative way. The methodology is based on earlier work by

An Example of a New Type of Cosmological Solutions of Einstein's Field Equations of Gravitation
K. Gödel
Rev. Mod. Phys. 21(3) (1949) 447-450

Gravitational Radiation from Colliding Black Holes
S. W. Hawking
Phys. Rev. Lett. 26 (1971) 1344-1346

On Continued Gravitational Contraction
J. R. Oppenheimer and H. Snyder
Phys. Rev. 56 (1939) 445-459