  Magnetic monopoles may be produced by the dual Schwinger effect in strong
magnetic fields. Today, the strongest known magnetic fields in the universe are
produced fleetingly in heavy-ion collisions. We use the complex worldline
instanton method to calculate the momentum distribution of magnetic monopoles
produced in heavy-ion collisions, in an approximation that includes the effect
of the magnetic field to all orders but neglects monopole self-interactions.
The result saturates the preparation time-energy uncertainty principle, and
yields a necessary ingredient for experimental monopole searches in heavy-ion
collisions.
