Germain Tobar(Stockholm U.), Sreenath K. Manikandan(Royal Inst. Tech., Stockholm), Thomas Beitel(Stevens Tech.), Igor Pikovski(Stockholm U. and Stevens Tech.)
We apply a novel approach based on physics-informed neural networks to the computation of quasinormal modes of black hole solutions in modified gravity. In particular, we focus on the case of Einstein-scalar-Gauss-Bonnet theory, with several choices of the coupling function between the scalar field and the Gauss-Bonnet invariant.
We construct and explore Noether charge-swapping structures of boson stars, drawing inspiration from similar configurations of non-topological solitons in Minkowski space (Charge-swapping Q-balls). The resulting structures are dynamic, with a multipolar structure and both positive and negative Noether charges within a star.
We analyze the dynamics of a collisionless kinetic gas propagating in the exterior of a rotating Kerr black hole. We focus on the phase space region corresponding to orbits that are bounded in space.
The stimulating "Black Holes Inside and Out" meeting took place in Copenhagen, Denmark, in August 2024. C. Herdeiro was one of the invited speakers. More info here.
Within the decade long collaboration between Gr@v and the gravity group at Federal University of Pará, Brasil, C. Herdeiro visited the UFPA Campi in Belém and Salinas in August 2024, giving scientific seminars and outreach talks.
A computing proposal prepared by S. Gimeno-Soler, P. Cunha, I. Sengo and C. Herdeiro, and led by H. Olivares was awarded with 12 million CPU-hours at the supercomputer Mare Nostrum 5.
The project, titled "Exploring accretion and spacetime models for event-horizon-scale observations of low-luminosity active galactic nuclei", will explore new models of accretion flows and spacetime geometries for the targets of the Event Horizon Telescope using simulations as the one shown in the picture (Image credit: H. Olivares and P. Cunha).
This week Gr@v hosted A. Bernal and J. Barranco from Guanajuato (Mexico) and E. Gasperín from IST-Lisbon. Great seminars and discussions. Thank you for your visits!
Our group coordinated the "Numerical Relativity and High Energy Physics" IRSES network (2012-2015). Here is a list of the global network meetings organized:
