Silhouette of M87*: A new window to peek into the world of hidden dimensions

The remarkable agreement of general relativity (GR) with a host
of experimental tests only adds to its phenomenal success. However, its
inability to satisfactorily explain observations like galactic rotation
curves and the accelerated expansion of the universe makes the quest for a
more complete theory increasingly compelling. This may either involve
modifications in the gravity sector or additions to the matter sector or
both. In this talk, I will consider modifications of the gravitational
field equations by invoking extra dimensions and discuss its consequences
and implications on the recent observation of the shadow of the
supermassive black hole M87* by the Event Horizon Telescope collaboration.

The talk is based on the research published in Phys. Rev. D. 101,
041301(R) (2020).