The Essay "How fast can a black hole rotate?", by C. Herdeiro and E. Radu, was selected for an "Honorable Mention" in the Gravity Research Foundation 2015 Awards for Essays on Gravitation. It is the second consecutive year an essay from our group gets this distinction. The first prize was awarded to the Nobel Laureate Gerard 't Hooft, for the essay "Local Conformal Symmetry: the Missing Symmetry Component for Space and Time".
Abstract: It is well known that electromagnetic and gravitational waves scatter as well as get converted to one another by a charged black hole. We demonstrate that the electromagnetic and gravitational scattering and conversion cross s
Abstract: I will discuss the relevance of the spins of massive black holes as probes of the coevolution of these objects with their host galaxies, as well as for the dynamics of binary systems and accretion disks, and for gravitational-wave emission. I will also present a semi-analytical model for the cosmological evolution of the spins of the massive black-hole population, and show that comparison of this model to existing spin measurements from relativistic iron lines allows one to put constraints on competing accretion scenarios. I will also comment on the prospects to test this model using future gravitational-wave space-based detectors.
Abstract: In the current paradigm, AGNs are galaxies that harbour in their centre super massive black holes, the later being the main engine that explains the multi-messenger and extreme nature of these objects. In this talk I will present recent results from a multi-frequency study of radio loud AGNs, and summarise work in progress in the framework of the Gaia (ESA) mission and the Square Kilometer Array pathfinders.
Our group coordinated the "Numerical Relativity and High Energy Physics" IRSES network (2012-2015). Here is a list of the global network meetings organized:
