Is super-Planckian physics visible? -- Scattering of black holes in 5 dimensions

Understand

It may be widely believed that probing short-distance physics is limited by the presence of the Planck energy scale above which scale any information is cloaked behind a horizon.

• If this hypothesis is correct, we could observe quantum behavior of gravity only through a black hole of Planck mass.
• We numerically show that in a scattering of two black holes in the 5-dimensional spacetime, a visible domain, whose curvature radius is much shorter than the Planck length, can be formed.
• Our result indicates that super-Planckian phenomena may be observed without an obstruction by horizon formation in particle accelerators.