Plasmatic Lensing Surrounding Compact Object

BRIOZZO GASTON; GALLO EMANUEL

Conferencia; cosmosur vi; 2022

Deflection of light by gravitational potentials is a classic phenomenon of General Relativity. Compact objects are known togenerate convergent gravitational lensing effects.On this presentation we will study how the presence of a refractive plasma surrounding compact objects, produces (mostof the times) a divergent lens effect that competes with the gravitational lensing, altering the trajectories of photons andgenerating a range of chromatic effects.So, we will consider space-times static and asymptotically flat, filled with a plasma not magnetized and pressureless.First, we will focus on the study of slow rotation pulsars, emphasizing in the numerical calculation of the photons trajectoriesand the pulse profiles generated by emission caps. Then, we will propose analytical approaches for a simpler analysis ofthese problems.Secondly, we will study the shadows of rotating black holes, showing some methods for obtaining axisymmetric metrics,and focusing on the numerical calculation of the shadows, also, we will be considering relativistic aberration effects.Finally, we will discuss some of the numerical methods that were used.