Can electroweak bubble walls run away?

Bödeker D, Moore GD (2009)
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS 2009(05): 009.

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In extensions of the Standard Model with SU(2) singlet scalar fields, there can be regions of parameter space for which the electroweak phase transition is first order already at the mean-field level of analysis. We show that in this case the phase interface ( bubble wall) can become ultra-relativistic, with the relativistic gamma factor gamma = (1 - v(wall)(2))(-1/2) growing linearly with the wall's propagation distance. We provide a simple criterion for determining whether the bubble wall "runs away" in this way or if gamma approaches a terminal value.
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Bödeker D, Moore GD. Can electroweak bubble walls run away? JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS. 2009;2009(05): 009.
Bödeker, D., & Moore, G. D. (2009). Can electroweak bubble walls run away? JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2009(05): 009.
Bödeker, D., and Moore, G. D. (2009). Can electroweak bubble walls run away? JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS 2009:009.
Bödeker, D., & Moore, G.D., 2009. Can electroweak bubble walls run away? JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2009(05): 009.
D. Bödeker and G.D. Moore, “Can electroweak bubble walls run away?”, JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, vol. 2009, 2009, : 009.
Bödeker, D., Moore, G.D.: Can electroweak bubble walls run away? JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS. 2009, : 009 (2009).
Bödeker, Dietrich, and Moore, Guy D. “Can electroweak bubble walls run away?”. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS 2009.05 (2009): 009.
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