# Watching Kerr Ring Singularity

Can you see light from ring singularity from inside the Cauchy Horizon? In between 2 horizons space and time coordinate swaps places, so the inside region lies at the future. But after crossing Cauchy time starts behaving normally, so light from the ringulaty should be visible to an observer in this region.

• spelling: "ringularity" - quite good ;) Oct 4 '21 at 10:27
• You shouldn't really get hung up with the ring singularity, anything after the cauchy horizon is an unphysical mathematical artificat. In fact, there are infinitely many things that may happen beyond the Cauchy horizon, and the ring singularity is merely one of them, that we get when we assume the metric is analytic. This assumption is unphysical, because information about a given point can give you the full spacetime configuration, and that is not go well with notions like causality. Oct 11 '21 at 21:13