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We study bubble universe collisions in the ultrarelativistic limit with thenew feature of allowing for nontrivial curvature in field space. We establish asimple geometrical interpretation of such collisions in terms of a doublefamily of field profiles whose tangent vector fields stand in mutual paralleltransport. This provides a generalization of the well-known flat field spacelimit of the free passage approximation. We investigate the limits of thisapproximation and illustrate our analytical results with a numericalsimulations.

Kink Collisions in Curved Field Space