Abstract: In this talk I will discuss peculiar mathematical properties of two types of black hole spacetimes, the extremal Kerr spacetime and the Reissner-Nordström-de Sitter spacetime.
Abstract: We shall be investigating whether there is near-horizon supersymmetry enhancement in supersymmetric black hole solutions to minimal gauged supergravity in five dimensions; as all known black holes of the gauged theory exhibit supersymmetry enhancement from $1/4$ to $1/2$ in the near
Abstract: Numerical relativity in higher dimensional spacetimes has been one of powerful tools to study various phenomina such as the stability of higher dimensional black holes and the verification for higher dimensional gravity.
Abstract: Classical scalar fields have been proposed as possible candidates for the dark matter component of the universe. Given the fact that super-massive black holes seem to exist at the center of most galaxies, in order to be a viable candidate for the dark matter halo a scalar field configuration should be stable in the presence of a central black hole, or at least be able to survive for cosmological time-scales. In the present work we consider a scalar field as a test field on a Schwarzschild background, and study under which conditions one can obtain long-lived configurations. We show that there exist configurations that can remain surrounding a black hole for large time-scales. In particular, ultra-light scalar field dark matter around supermassive black holes can survive for cosmological times.
Our group coordinated the "Numerical Relativity and High Energy Physics" IRSES network (2012-2015). Here is a list of the global network meetings organized:
