Conferències al DAA. Xarrada a càrrec de l'investigador predoctoral Nicolás Sanchis Gual, del Departament d'Astronomia i Astrofísica (UVEG). Lloc: Seminari del Departament d'Astronomia i Astrofísica, 4a planta de l'Edifici d'Investigació, a Burjassot. Dia: dijous 21 d'abril de 2016. Hora: 12:00.
Abstract:
I will present our results of a series of numerical relativity simulations of dynamical nonrotating black holes surrounded by self-gravitating scalar fields. In the non-charged case, even in the non-linear regime, quasistationary configurations of scalar fields are formed around black holes. Such configurations have been found to survive for cosmological time scales, which is a requirement for viable dark matter halo models in galaxies based on such types of structures.
On the other hand, a Reissner-Nordström black hole (BH) is superradiantly unstable against spherical perturbations of a charged scalar field, enclosed in a cavity, with frequency lower than a critical value. We use the numerical relativity techniques to follow the development of this unstable system – dubbed charged BH bomb – into the non-linear regime, solving the full Einstein–Maxwell–Klein-Gordon equations, in spherical symmetry.
Llista d'enllaços:
Imatges:
