How aether censors singularities (and the most beautiful penrose diagrams you’ll ever see)

Einstein’s General theory of Relativity predicts the occasions of its own demise. These are known as spacetime singularities, where Einstein’s equations fail to predict the future. However, in most typical situations, we have found that the singularities lie behind event horizons of black holes. Since nothing moves faster than speed of light in Relativity, and light cannot escape event horizons, then it appears that most common singularities are invisible to us. Penrose promoted this observation to the Cosmic Censorship conjecture, proposing that singularities are generically censored by event horizons, to outside observers.

But what if something can travel faster (even infinitely faster) than speed of light? Would that render singularities naked and exposed?! My students Mike Meiers and Mehdi Saravani have just posted a paper on arXiv showing that even if gravity has an incompressible aether (with infinitely fast signals), it can still manage to censor its own singularities in collapsing charged and spinning black holes.

Also, congratulations to Mike on his first paper (and Mehdi for his 9th!), and the most beautiful Penrose diagrams that I have ever seen 🙂 (The red regions are censored by aether).

Read more here.

 

Advertisements