How close can you go to a black hole?| Photon rings explained

#blackhole #generalrelativity #einstein
Hello everyone,
In this video, we discuss photon rings and photon spheres around black holes. We use Einstein’s General Theory Of Relativity to derive the closest orbit at R=3GM that a photon of light can take as it orbits around a simple Schwarzchild Black Hole.
We also show parallel real-world observations and hint at how we can finally have the required resolution to resolve the photon ring around the black hole using upgraded VLBI.
Paper used:
1. The Photon Ring in M87* (iopscience.iop.org/article/10...)
A huge shout-out to the Manim community for building and maintaining Manim! Go check them out: github.com/3b1b/manim
Let me know if you have any questions! Stay tuned for some of the upcoming videos!
Timestamps :
0:00 Background
1:55 Context of the Video
3:31 The black hole math (photon ring)
5:14 Real black hole data and simulations
6:55 Outro and future of VLBI