Abstract

The physics of super-Planckian collisions dates back to the late 80's. (For general references see Ref. ) The renewed interest in super-Planckian events stems from the possibility that the fundamental scale of gravity may be much lower than the observed gravitational scale, even of the order of a few TeV. In braneworld scenarios with large extra dimensions, the observed weakness of the gravitational field is due to the leakage of gravity in the extra dimensions: standard model (SM) fields are constrained in a four-dimensional submanifold, whereas gravitons are allowed to freely propagate in the higher-dimensional spacetime. If the coupling constant of the gravitational field is ~ TeV, strong gravitational effects become manifest at this scale. Super-Planckian collisions would then take place in next-generation particle colliders, such as the Large Hadron Collider (LHC), and in the atmosphere, induced by ultra high energy cosmic rays (UHECRs). An entire session of this conference is devoted to black hole (BH) formation from high energy collisions. Here, I will simply present a brief overview of nonperturbative gravitational effects in super-Planckian scattering.

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