This week

The dynamics of QCD, unlike QED and gravity, is predominantly quantum in nature. We outline how a semi-classical regime emerges in the high energy Regge limit of the theory, where the dynamics is described by Yang-Mills equations, and multi-particle production is described by shockwave scattering. We demonstrate that trans-Planckian scattering in Einstein gravity can be understood similarly, with emergent double copy structures in gravitational radiation. We discuss possible consequences of this IR <-> UV correspondence in the two theories.