I will discuss the first 3D-general relativistic magnetohydrodynamic (GRMHD) simulation of sustained accretion onto a horizonless singularity in which matter falls onto the central object rather than being accumulated outside of it or expelled in outflows.
In this talk, I describe in detail how one might understand the termination of the event horizon of a black hole in terms of of quasiregular singularity characterized by points possessing two future-directed light cones and two past-directed light cones (in fact this spacetime is conformal to a region of the 1+1 trousers spacetime).
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!
On February 3rd, 2026, our group, together with a few special guests, gathered to bid farewell to our dear colleague Ana Bokulic, who is returning to her hometown of Zagreb. It was a lovely occasion to share memories and good wishes. We also said goodbye to our friend Romain Gervalle (in absentia) as he returns to France. We look forward to welcoming you both again soon!
Our friend and collaborator Haroldo Junior visited Aveiro for a few weeks in February 2026. A former PhD student in Belém/Aveiro and now a faculty member at Universidade Federal do Maranhão in São Luís, it was a pleasure to have him back. In the photo, Haroldo is joined by our very esteemed secretary, Cristina.
In the last week of January 2026, a research school on black holes and related topics took place in the beautiful setting of Licán Ray, Chile, nestled in a stunning volcanic lake region. C. Herdeiro was among the invited lecturers, with sessions held - quite fittingly - on whiteboards set up in the garden. The combination of great science and a relaxed, inspiring atmosphere made for a truly memorable event. Many thanks to Adolfo Cisterna and his team for making it all possible.
Our group coordinated the "Numerical Relativity and High Energy Physics" IRSES network (2012-2015). Here is a list of the global network meetings organized:
