Equilibrium accretion tori are used as initial conditions for GRMHD simulations to study accretion onto compact objects. In this talk, I present the construction of magnetized Komissarov-type discs within hairy black hole spacetimes. I show that equilibrium configurations can be consistently obtained in these backgrounds, as in the standard Kerr case.
In this talk I will present some results regarding the evolution of black holes which possess inner horizons. I will begin by giving an overview of the dynamical formation of such black holes, and the characteristics of their evolution, in contrast to maximally extended solutions.
Astrophysical environments provide an arena to test vacuum General Relativity with gravitational waves. In this talk, I will discuss what binary black hole observations can probe beyond the vacuum paradigm, and where fundamental limitations arise.
Our understanding of the cosmos is shaped by what we are able to observe in the sky. Resolving progressively smaller astrophysical structures requires instruments with increasingly high angular resolution. However, even an ideal telescope is limited by nature through diffraction, which ties its resolving power to the diameter of its collecting aperture.
In January-February we received the visits of Andrea Maselli (Grand Sasso, Italy), Gabriel Ribeiro (UFPA, Brazil) and Juan José Vázquez (INAOE, Mexico). Knowledge transfer in action!
The Science and art exhibit "Traces of curvature" will reopen on January 20, 2026 at Fábrica, "Centro Ciência Viva", in Aveiro, and stay in exhibition for three months.
Black holes are not merely cosmic sinks; they are the universe's most efficient reservoirs of energy, characterized by their mass, angular momentum (spin), electric charge, and surrounding magnetic fields. We explore the theoretical frameworks for tapping into these vast reserves.
In this talk, I will present our recent work on scattering of two boson stars by taking into account three effects: point-mass gravitational, tidal, and short-range scalar-field interactions. We first derive the analytical expressions of the scattering angle using PM-EFT techniques, providing the first analytical treatment of boson stars as a two-body problem.
Our group coordinated the "Numerical Relativity and High Energy Physics" IRSES network (2012-2015). Here is a list of the global network meetings organized:
