Baryogenesis from Unstable Domain Walls

Abstract

There exists a class of cosmic strings that turn matter into antimatter (Alice strings). In a GUT where the unbroken gauge group contains charge conjugation ($C$), such strings form when a phase transition renders $C$ a discrete symmetry. They become boundaries of domain walls at a later, $C$-breaking transition. These `Alice walls' are cosmologically harmless, but can play an important role in baryogenesis. We present a three-generation toy model with scalar baryons, where a quasi-static Alice wall (or a gas of such walls) temporarily gives rise to net baryogenesis of uniform sign everywhere in space. This becomes a permanent baryon excess if the wall shrinks away early enough. We comment on the possible relevance of a similar mechanism to baryogenesis in a realistic $\soten$ unification model, where Alice walls would form at the scale of left-right symmetry breaking.

SLAC-PUB-5828, May 92. 28 pp. Seven figures (not included). Use PHYZZX

References in corpus (1)

• Superconductivity Solves the Monopole Problem for Alice Strings

Cited by in corpus (8)

• Composite defect extends cosmology - 3He analogy
• Observation of wall-vortex composite defects in a spinor Bose-Einstein condensate
• Spontaneously broken parity and consistent cosmology with transitory domain walls
• Transient domain walls and lepton asymmetry in the Left-Right symmetric model
• Topological Defects in the Left-Right Symmetric Model and their Relevance to Cosmology
• Superconductivity Solves the Monopole Problem for Alice Strings
• Baryogenesis
• Leptogenesis with Left-Right domain walls