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Symmetry non-restoration via order 10(-10) B and L asymmetries

Research output: Contribution to Journal/MagazineJournal articlepeer-review

  • John McDonald
<mark>Journal publication date</mark>30/09/1999
<mark>Journal</mark>Physics Letters B
Issue number2-4
Number of pages5
Pages (from-to)225-229
Publication StatusPublished
<mark>Original language</mark>English


It has been observed that a large lepton asymmetry, n(L)/s approximate to 0.1, can prevent the Higgs expectation value from going to zero at high temperature, resulting in the non-restoration of the SU(2) x U(1) gauge symmetry and other symmetries. This could allow for the elimination of domain walls and other dangerous topological defects. Here we show that if the reheating temperature after inflation, T-R is sufficiently low then symmetry non-restoration will occur with an asymmetry of the order of the observed baryon asymmetry, n(B)/s approximate to 10(-10). For this to occur T-R less than or similar to 1 GeV is necessary. Remarkably, this happens to be the reheating temperature expected in Affleck-Dine baryogenesis along a d = 6 flat direction of the MSSM. As an example, we show that this can neatly solve the Z(3), domain wall problem of the NMSSM.