Consider the Reissner-Nordström metric
$$ds^2=-f(r)dt^2+f^{-1}dr^2-r^2d\Omega^2\hspace{2cm}
f(r)=1-\frac{2M}{r}+\frac{M^2q^2}{r^2}$$
where I defined the charge-to-mass ratio $q:=Q/M$, which satisfies $|q|\leq 1$ to avoid naked singularities. As is well known, there are two horizons (or only a si...
By examining the causal structure of a Schwarzschild black hole, one can see that a particle in region II is unable to escape to $r=\infty$.
Such diagrams do not show, however, how long a particle can survive inside of region II without hitting the singularity. Can a particle survive indefinit...
A month or so ago, we had a question stemming from legal interests. The question mostly follows the site's guidelines, and it doesn't seem promotional in content. But certain characteristics of the questions make it seem of an interest not those of "active researchers, academics and students of p...
