Magnetic field generation in first order phase transition bubble collisions

Abstract

We consider the formation of a ring-like magnetic field in collisions of bubbles of broken phase in an abelian Higgs model. Particular attention is paid on multiple collisions. The small collision velocity limit, appropriate to the electroweak phase transition, is discussed. We argue that after the completion of the electroweak phase transition, when averaged over nucleation center distances, there exists a mean magnetic field $B\simeq 2.0\times 10^{20}$ G with a coherence length $9.1\times 10^{3}Ge{V}^{-1}$ (for m_H=68 GeV). Because of the ring-like nature of B, the volume average behaves as $B\sim 1/L$. Taking into account the turbulent enhancement of the field by inverse cascade, we estimate that colliding electroweak bubbles would give rise to a mean field $B_{rms}\simeq 10^{-21}$ G at 10 Mpc comoving scale today.

Latex, 18 pages, 8 figures

References in corpus (2)

• Primordial Magnetic Fields, Right Electrons, and the Abelian Anomaly
• Bubble collisions in SU(2)xU(1) gauge theory and the production of non-topological strings

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