946 research outputs found
Warped 5D Standard Model Consistent with EWPT
For a 5D Standard Model propagating in an AdS background with an IR localized
Higgs, compatibility of bulk KK gauge modes with EWPT yields a
phenomenologically unappealing KK spectrum (m > 12.5 TeV) and leads to a
"little hierarchy problem". For a bulk Higgs the solution to the hierarchy
problem reduces the previous bound only by sqrt(3). As a way out, models with
an enhanced bulk gauge symmetry SU(2)_R x U(1)_(B-L) were proposed. In this
note we describe a much simpler (5D Standard) Model, where introduction of an
enlarged gauge symmetry is no longer required. It is based on a warped
gravitational background which departs from AdS at the IR brane and a bulk
propagating Higgs. The model is consistent with EWPT for a range of KK masses
within the LHC reach.Comment: 7 pages, 3 figures. Based on talk given by M. Quiros at the Workshop
on the Standard Model and Beyond - Cosmology, Corfu Summer Institute, Greece,
August 29 - September 5, 201
Finitely presented lattice-ordered abelian groups with order-unit
Let be an -group (which is short for ``lattice-ordered abelian
group''). Baker and Beynon proved that is finitely presented iff it is
finitely generated and projective. In the category of {\it unital}
-groups---those -groups having a distinguished order-unit
---only the -direction holds in general. Morphisms in
are {\it unital -homomorphisms,} i.e., hom\-o\-mor\-phisms
that preserve the order-unit and the lattice structure. We show that a unital
-group is finitely presented iff it has a basis, i.e., is
generated by an abstract Schauder basis over its maximal spectral space. Thus
every finitely generated projective unital -group has a basis . As a partial converse, a large class of projectives is constructed from
bases satisfying . Without using the
Effros-Handelman-Shen theorem, we finally show that the bases of any finitely
presented unital -group provide a direct system of simplicial
groups with 1-1 positive unital homomorphisms, whose limit is
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