Abstract
We calculate axion radiation emitted in the collision of two straight global strings. The strings are supposed to be in the unexcited ground state, to be inclined with respect to each other, and to move in parallel planes. Radiation arises when the point of minimal separation between the strings moves faster than light. This effect exhibits a typical Cerenkov nature. Surprisingly, it allows an alternative interpretation as bremsstrahlung under a collision of point charges in $2+1$ electrodynamics. This can be demonstrated by suitable world-sheet reparametrizations and dimensional reduction. Rough cosmological estimates show that the contribution of the bremsstrahlung axions to the total axion density left after the QCD phase transition might exceed the contribution from the vacuum realignment.
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