"2->n scattering in QCD (and gravity): from amplitudes to shockwaves" by Raju Venugopalan (Brookhaven National Lab and Univ. of Edinburgh)

The dynamics of QCD, unlike QED and gravity, is predominantly quantum in nature. With increasing boost, 2->n amplitudes are driven by perturbative s-channel fractionation described by the BFKL equation. However at sufficiently large boosts, perturbation theory breaks down and a novel nonperturbative (albeit weakly coupled) semi-classical regime of the theory emerges,  described by the Color Glass Condensate (CGC) EFT. Multi-particle production in the CGC EFT occurs via t-channel fractionation, creating a superfluid-like Glasma squeezed state, which subsequently evolves to form a Quark-Gluon Plasma. 
We demonstrate that trans-Planckian scattering of shockwaves in Einstein gravity can be understood similarly, with emergent double copy structures in gravitational radiation.