On the cosmological domain wall problem for the minimally extended supersymmetric standard model

We study the cosmology of the Supersymmetric Standard Model augmented by a gauge singlet to solve the μ-problem and describe the evolution of the domain walls which are created during electroweak symmetry breaking due to the discrete Z 3 symmetry in this model. The usual assumption that (gravitation...

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Bibliographic Details
Published in:Nuclear physics. B 1995-11, Vol.454 (3), p.663-681
Main Authors: Abel, S.A., Sarkar, S., White, P.L.
Format: Article
Language:English
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Summary:We study the cosmology of the Supersymmetric Standard Model augmented by a gauge singlet to solve the μ-problem and describe the evolution of the domain walls which are created during electroweak symmetry breaking due to the discrete Z 3 symmetry in this model. The usual assumption that (gravitationally induced) non-renormalisable terms which explicitly break this symmetry may cause the walls to collapse on a cosmologically safe timescale, is reconsidered. Such terms are constrained by considerations of primordial nucleosynthesis, and also because (by not respecting the Z 3 symmetry) they induce divergences which destabilise the hierarchy and reintroduce the μ-problem. We find that, even when the Kähler potential is ‘non-minimal’ (i.e. when the hidden sector couples directly to the visible), the model is either ruled out cosmologically or suffers from a naturalness problem.
ISSN:0550-3213
1873-1562
DOI:10.1016/0550-3213(95)00483-9