We consider possible perturbations of the black hole event horizon induced by matter with spin, extending derivation Hawking-Hartle formula (tidal heating) in presence torsion. When specialised to theories a non-vanishing (pseudo-)traceless component (con)torsion tensor, we remarkably find that tidal heating phenomenon gets modified additional torsion-dependent terms, agreement previous investi...

We are investigating numerically the non-linear behavior of a spaceperiodic MHD system with ABC forcing. Most computations are performed for magnetic Reynolds numbers increasing from 0 to 60 and a fixed kinematic Reynolds number, small enough for the trivial solution with a zero magnetic field to be stable to velocity perturbations. At the critical magnetic Reynolds number for the onset of inst...

Upcoming large-scale-structure surveys can shed new light on the properties of dark energy. In particular, if energy is a dynamical component, it must have spatial perturbations. Their behaviour regulated by speed sound parameter, which currently unconstrained. this work we present numerical methods that will allow to perform cosmological simulations inhomogeneous scenarios where small and non-...