  Primordial magnetic fields may be created in collisions of expanding bubbles
in a first-order cosmological phase 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
magnetic fields are created in electroweak two-bubble collisions.
