出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We describe a model for the scalar sector where all interactions occur either at an ultra-high
scale LU 10161019 GeV or at an intermediate scale LI = 1091011 GeV. The interaction of
physics on these two scales results in an SU(2) Higgs condensate at the electroweak (EW) scale,
LEW, through a seesaw-like Higgs mechanism, LEW L2I
=LU, while the breaking of the SM
SU(2)U(1) gauge symmetry occurs at the intermediate scale LI . The EW scale is, therefore,
not fundamental but is naturally generated in terms of ultra-high energy phenomena and so the
hierarchy problem is alleviated. We show that our “seesaw-Higgs” model predicts the existence
of sub-eV neutrino masses which are generated through a “two-step” seesaw mechanism in terms
of the same two ultra-high scales: mn L4I
=L3U
L2
EW=LU. We also show that our seesaw Higgs
model can be naturally embedded in theories with tiny extra dimensions of size R L1
U 1016
fm, where the seesaw induced EW scale arises from a violation of a symmetry at a distant brane
if there are 7 tiny extra dimensions.
