Collectivity in ultra-peripheral heavy-ion and e+A collisions

Abstract

We review recent theoretical progress in describing collective effects in photon+nucleus collisions. The approaches considered range from the color glass condensate where correlations are encoded in the initial state, to hydrodynamic frameworks, where a strong final state response to the initial geometry of the collision is the key ingredient to generate momentum-space correlations.

Comments: 8 pages, 1 figure, presented at "Diffraction and Low-$x$ 2024'', Trabia (Palermo, Italy), September 8-14, 2024