TY - JOUR

T1 - Biased discrete symmetry and domain wall problem

AU - Dvali, G.

AU - Tavartkiladze, Z.

AU - Nanobashvili, J.

PY - 1995/6/15

Y1 - 1995/6/15

N2 - We reconsider the cosmological evolution of domain walls produced by the spontaneous breaking of an approximate discrete symmetry. We show that domain walls may never collapse, even if the standard bound on the vacuum energy asymmetry is satisfied. Instead of disappearing, these defects may form stable "bound states"-double wall systems. Possible stability of such a wall is a dynamical question and consequently restricts the allowed range of parameters. In particular, in the two Higgs doublet standard model with an anomalous Z2 symmetry, the above restriction suggests the mass of the pseudoscalar Higgs (would be axion) being close to the mass of the scalar one.

AB - We reconsider the cosmological evolution of domain walls produced by the spontaneous breaking of an approximate discrete symmetry. We show that domain walls may never collapse, even if the standard bound on the vacuum energy asymmetry is satisfied. Instead of disappearing, these defects may form stable "bound states"-double wall systems. Possible stability of such a wall is a dynamical question and consequently restricts the allowed range of parameters. In particular, in the two Higgs doublet standard model with an anomalous Z2 symmetry, the above restriction suggests the mass of the pseudoscalar Higgs (would be axion) being close to the mass of the scalar one.

UR - http://www.scopus.com/inward/record.url?scp=0343745312&partnerID=8YFLogxK

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U2 - 10.1016/0370-2693(95)00511-I

DO - 10.1016/0370-2693(95)00511-I

M3 - Article

AN - SCOPUS:0343745312

VL - 352

SP - 214

EP - 219

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

SN - 0370-2693

IS - 3-4

ER -