Bubble Wall Velocity at the Electroweak Phase Transition

Details Bubble Wall Velocity at the Electroweak Phase Transition Bubble Wall Velocity at the Electroweak Phase Transition

1995-03-10

arxiv.org/abs/hep-ph/9503296v1

Phys.Rev.Lett. 75 (1995) 777-780

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, plain LaTex

Scientific paper

10.1103/PhysRevLett.75.777

We calculate the velocity and thickness of a bubble wall at the electroweak phase transition in the Minimal Standard Model. We model the wall with semiclassical equations of motion and show that friction arises from the deviation of massive particle populations from thermal equilibrium. We treat these with Boltzmann equations in a fluid approximation in the background of the wall. Our analysis improves on the previous work by using the two loop effective potential, accounting for particle transport, and determining the wall thickness dynamically. We find that the wall is significantly thicker than at phase equilibrium, and that the velocity is fairly high, $v_w \simeq 0.7c$, and quite weakly dependent on the Higgs mass.

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