Primordial magnetic fields may be created in collisions of expanding bubbles in a first-order cosmological pohase transition and later serve as seed fields for galactic magnetic fields. Here I present results from numerical and analytical studies of U(1) bubble collisions done in collaboration with Ed Copeland and Paul Saffin. I also reveal preliminary results from analytical studies of SU(2)xU(1) bubble collisions, which provide first evidence that magentic fields are created in electroweak two bubble collisions.
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