Probing spacetime and accretion model for the Galactic Center: Comparison of Kerr and dilaton black hole shadows

Understand

In the vicinity of black holes, the influence of strong gravity, plasma physics, and emission processes govern the behavior of the system.

• Since observations such as those carried out by the EHT are not yet able to unambiguously constrain models for astrophysical and gravitational properties, it is imperative to explore the accretion models, particle distribution function, and description of the spacetime geometry.
• Our current understanding of these properties is often based on the assumption that the spacetime is well-described by by the Kerr solution to general relativity, combined with basic emission and accretion models.
• We explore alternative models for each property performing general relativistic magnetohydrodynamic and radiative transfer simulations.