I'll present some recent results and new ideas on the effects that global monopoles combined with modified gravity à la Palatini could have for black holes and Hawking radiation.
Scalar-tensor theories of gravity have become a very rich framework from which one can construct viable phenomenological models of early- and late-time cosmology. In particular for inflation, previous models constructed using the Horndeski Lagrangian give predictions which are now in tension with CMB data. On the other hand, by trying to fit the observations, one would find instabilities at...
Generalized Complex Geometry was introduced by the British mathematician Nigel Hitchin and further developed by his PhD students Gil Cavalcanti and specially Marco Gualtieri. The aim of Generalized Geometry is to combine symplectic and complex geometries in a single structure.
In this talk, I will introduce the basic concepts for this theory and how it arises in a natural way in supersymmetric...
We review the trouble with space-time singularities within General Relativity and how gravitational theories formulated in metric-affine spaces and with a nice analogy with crystalline structures can have the key to their resolution. Focusing on spherically symmetric black holes by simplicity, we shall see the simple economy of these models in getting rid of such singularities. Some elements...
Following the valuable technique of 2D moving mirror model, used to mimic Black Holes spacetime geometry, quantum modeling of a 1+1 wormhole and possible particle production is being analyzed. Application to viability of a time machine is also discussed.
The dawn of gravitational-wave astronomy opens up an observational window to probe the true nature of astrophysical black hole candidates. These are widely believe to be well described, when near equilibrium, by the Kerr metric. But more exotic theoretical possibilities have been put forward, including horizonless compact objects. Such objects have the theoretical appeal of avoiding conceptual...
Testing the true nature of black holes – the no-hair hypothesis – will become increasingly more precise in the next few years as new observational data is collected in both the gravitational wave channel and the electromagnetic channel. In this talk we will consider numerically generated spacetimes of Kerr black holes with synchronised scalar hair and build stationary models of magnetized...
