Abstract:

Accretion onto black holes is closely linked to powerful outflows and
jets that influence their surroundings, establishing a complex cycle
of feeding and feedback across multiple scales. In this talk, I will
present recent GRMHD simulations that explore feeding and feedback in
black hole systems across different physical settings. I will discuss
how asymmetric large-scale magnetic fields reshape accretion flows
around rapidly spinning black holes, introducing strong deviations
from equatorial symmetry in both inflow and outflow structures and
leading to time-dependent, highly asymmetric magnetised outflows,
particularly in the coronal region. I will then discuss black hole
feeding through cold chaotic accretion, where cold gas clouds injected
from large radii interact with an evolving magnetised flow,
potentially driving variability in accretion rates and modifying
angular momentum transport in a multiphase environment. These studies
provide insight into the multi-scale interplay between black hole
feeding and feedback, connecting galactic-scale cold gas inflows to
horizon-scale accretion and outflow dynamics.