Charge-dependent flow as evidence of strong electromagnetic fields in heavy-ion collisions

Understand

The extremely large electromagnetic fields generated in heavy-ion collisions provide access to novel observables that are expected to constrain various key transport properties of the quark-gluon plasma and could help solve one of the outstanding puzzles in QCD: the strong CP problem.

• In this review we present a brief overview of the theoretical and experimental characterization of these electromagnetic fields.
• After reviewing the current state, emphasising one of the observables -- the charge-dependent flow -- we discuss the various discrepancies between the measurements and theoretical predictions.
• Finally, to help resolve the discrepancies, we suggest new measurements and theoretical ideas.