Abstract: I will discuss the asymptotic structure in higher dimensional spacetimes, especially at null infinity of asymptotically flat spacetimes.
Abstract: We review the topic of black hole collisions. We will give an overview of what has been done so far in four dimensional vacuum gravity and we expand on our group's recent efforts of performing black hole collisions in asymptotically de Sitter spaces, Einstein-Maxwell theory and higher-dimensional vacuum gravity.
Abstract: We give a brief overview of naked singularities, how these can form from gravitational collapse and their possible relevance in astrophysics. We investigate how the black hole formation process described by the Oppenheimer-Snyder scenario is affected once small pressures are introduced in the collapsing matter cloud.
Abstract: n-DBI gravity is a gravitational theory introduced in arXiv:1109.1468[hep-th], motivated by Dirac-Born-Infeld type conformal scalar theory and designed to yield non-eternal inflation spontaneously. I explain that any solution of Einstein gravity with a particular curvature property is a solution of n-DBI gravity.
Abstract: We make a broad discussion, both mathematical and physical, of different aspects of Palatini theories of gravity. These theories are defined by the idea that metric and connection are physically independent entities, in such a way that the field equations are obtained by performing independent variations with respect to both of them.
Abstract: We shall review an analytic method, first used by D'Eath (1978), to study high speed collisions of black holes at finite boost, and extract the gravitational radiation.
Abstract: We develop a procedure for models described by one real scalar field in (1+1) dimensions, that makes posible to obtain new models and their static solutions straightforwardly from one known model. The method is illustrated by some applications and extended byp traveling wave solutions of systems described by high-order partial differential equations.