Inspired by noncommutative geometry in string theory, we introduce extended derivatives in black hole physics by incorporating a real antisymmetric rank-2 tensor, exhibiting similarities with certain string-theoretic fields.
Gr@v is hosting the visits of Yasha Shnir, long time group collaborator, under an FCT mobility grant, and Mario Luciano Navarro, Ph.D. student from Valencia in the spring 2026. In the photo Yasha and Mario enjoy a bit of sunshine after the weekly group lunch.
We present and study new nontopological soliton solutions in the U(1) gauged nonlinear O(3) sigma-model with a symmetry breaking potential in 3+1 dimensional space-time. The configurations are endowed with an electric and magnetic field and also carry a nonvanishing angular momentum density.
Oleg Tsupko, an expert in several strong gravity topics including lensing and black hole shadows, joins Gr@v as a CEEC researcher from April 2026. Welcome Oleg!
The Gr@v coordinator, C. Herdeiro, visited Prague to deliver two seminars, at CEICO and Charles University. The visit provided a great opportunity to reconnect with friends and colleagues in a city rich in scientific and cultural heritage - home to figures such as Kepler, Tycho Brahe, Einstein, Doppler, Mach, Bolzano, and Kafka. Many thanks to both groups for their kind hospitality and for making this visit 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:
