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The Electroweak phase transition in models with gauge-Higgs unification
Full text linkThe dynamics of five dimensional Wilson line phases at finite temperature is studied in the oneloop approximation. We show that at temperatures of order T ∼ 1/L, where L is the length of
the compact space, the gauge symmetry is always restored and the electroweak phase transition
appears to be of first order.
We focus on a specific model where the Wilson line phase is identified with the Higgs field
(gauge-Higgs unification). The transition is of first order even for values of the Higgs mass above
the current experimental limit. If large localized gauge kinetic terms are present, the transition
might be strong enough to give baryogenesis at the electroweak transitio
Nucleon Form Factors from 5D Skyrmions
No full textSeveral aspects of hadron physics are well described by a simple 5D effective field theory, Baryons arise in this scenario as "large" (and therefore calculable) 5D skyrmions. We extend and reline the existing analysis of this 5D soliton, which is fairly non-trivial due to the need of numerical methods. We perform the complete quantization of those collective coordinates which are relevant for computing the static observables like the nucleon form factors. We compare the result with simple expectations about large-N-c QCD and with the experimental data. An agreement within 30% is found. (C) 2009 Elsevier B.V. All rights reserved.S
A model of electroweak symmetry breaking from a fifth dimension
No full textWe reconsider the idea of identifying the Higgs field as the internal component
of a gauge field in the flat space ,
by relaxing the constraint of having unbroken SO(4,1) Lorentz symmetry in the bulk.
In this way, we show that the main common problems of previous models of this sort,
namely the prediction of a too light Higgs and top mass, as well as of a too low
compactification scale, are all solved. We mainly focus our attention on a
previously constructed model.
We show how, with few minor modifications and by relaxing the requirement
of SO(4,1) symmetry, a potentially realistic model can be obtained with a moderate
tuning in the parameter space of the theory. In this model,
the Higgs potential is stabilized and the hierarchy of fermion masses explained
The electroweak phase transition on orbifolds with gauge-Higgs unification
No full textThe dynamics of five dimensional Wilson line phases at finite temperature is studied in the
one-loop approximation.
We show that at temperatures of order , where
is the length of the compact space, the gauge symmetry is always restored and
the electroweak phase transition appears to be of first order.
Particular attention is devoted to the study of a recently proposed
five dimensional orbifold model (on ) where the Wilson line phase is
identified with the Higgs field (gauge-Higgs unification).
Interestingly enough, an estimate
of the leading higher-loop ``daisy'' (or ``ring'')
diagram contributions to the effective potential in a simple five
dimensional model,
seems to suggest that the electroweak phase transition can be
studied in perturbation theory even for Higgs masses above
the current experimental limit of 114 GeV.
The transition is still of first order for such values of the Higgs mass.
If large localized gauge kinetic terms are present, the transition
might be strong enough to give baryogenesis at the electroweak transition
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Simple and realistic composite Higgs models in flat extra dimensions
Full text linkISSN:1126-6708ISSN:1029-8479ISSN:1029-847
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