3,690 research outputs found
Gauge Coupling Unification via A Novel Technicolor Model
We show that the recently proposed minimal walking technicolor theory
together with a small modification of the Standard Model fermionic matter
content leads to an excellent degree of unification of the gauge couplings. We
compare the degree of unification with various time-honored technicolor models
and the minimal supersymmetric extension of the Standard Model. We find that,
at the one-loop level, the new theory provides a degree of unification higher
than any of the other extensions above. The phenomenology of the present model
is very rich with various potential dark matter candidates.Comment: Final version to match the published on
Fundamental Composite (Goldstone) Higgs Dynamics
31 pagesWe provide a unified description, both at the effective and fundamental Lagrangian level, of models of composite Higgs dynamics where the Higgs itself can emerge, depending on the way the electroweak symmetry is embedded, either as a pseudo-Goldstone boson or as a massive excitation of the condensate. We show that, in general, these states mix with repercussions on the electroweak physics and phenomenology. Our results will help clarify the main differences, similarities, benefits and shortcomings of the different ways one can naturally realize a composite nature of the electroweak sector of the Standard Model. We will analyze the minimal underlying realization in terms of fundamental strongly coupled gauge theories supporting the flavor symmetry breaking pattern SU(4)/Sp(4) SO(6)/SO(5). The most minimal fundamental description consists of an SU(2) gauge theory with two Dirac fermions transforming according to the fundamental representation of the gauge group. This minimal choice enables us to use recent first principle lattice results to make the first predictions for the massive spectrum for models of composite (Goldstone) Higgs dynamics. These results are of the upmost relevance to guide searches of new physics at the Large Hadron Collider
Confinement and Chiral Symmetry
We illustrate why color deconfines when chiral symmetry is restored in gauge
theories with quarks in the fundamental representation, and while these
transitions do not need to coincide when quarks are in the adjoint
representation, entanglement between them is still present.Comment: 4 pages, 1 figure, proceedings of Quark Matter 200
Gravitational Techniwaves
We investigate the production and possible detection of gravitational waves
stemming from the electroweak phase transition in the early universe in models
of minimal walking technicolor. In particular we discuss the two possible
scenarios in which one has only one electroweak phase transition and the case
in which the technicolor dynamics allows for multiple phase transitions.Comment: 30 pages, 5 figures. v2: minor changes, references added, title
changed in journa
A study of the influence of the gauge group on the Dyson-Schwinger equations for scalar-Yang-Mills systems
The particular choice of the gauge group for Yang-Mills theory plays an
important role when it comes to the influence of matter fields. In particular,
both the chosen gauge group and the representation of the matter fields yield
structural differences in the quenched case. Especially, the qualitative
behavior of the Wilson potential is strongly dependent on this selection.
Though the algebraic reasons for this observation is clear, it is far from
obvious how this behavior can be described besides using numerical simulations.
Herein, it is investigated how the group structure appears in the
Dyson-Schwinger equations, which as a hierarchy of equations for the
correlation functions have to be satisfied. It is found that there are
differences depending on both the gauge group and the representation of the
matter fields. This provides insight into possible truncation schemes for
practical calculations using these equations.Comment: 47 page
Electroweak phase transition in technicolor
Several phenomenologically viable walking technicolor models have been
proposed recently. I demonstrate that these models can have first order
electroweak phase transitions, which are sufficiently strong for electroweak
baryogenesis. Strong dynamics can also lead to several separate transitions at
the electroweak scale, with the possibility of a temporary restoration and an
extra breaking of the electroweak symmetry. First order phase transitions will
produce gravitational waves, which may be detectable at future experiments.Comment: 6 pages, 4 figures. Talk at PASCOS 2010 conference, Valencia, 19-23
July 201
Modelling study of transformations of the exchange flows along the Strait of Gibraltar
Abstract. Vertical transfers of heat, salt and mass between the inflowing
and outflowing layers at the Strait of Gibraltar are explored basing on the outputs of a
three-dimensional fully nonlinear numerical model. The model covers the entire
Mediterranean basin and has a very high spatial resolution around the strait
(1/200∘). Another distinctive feature of the model is that it includes a
realistic barotropic tidal forcing (diurnal and semi-diurnal), in addition to atmospheric
pressure and heat and water surface fluxes. The results show a significant transformation
of the properties of the inflowing and outflowing water masses along their path through
the strait. This transformation is mainly induced by the recirculation of water, and
therefore of heat and salt, between the inflowing and outflowing layers. The underlying
process seems to be the hydraulic control acting at the Espartel section, Camarinal Sill
and Tarifa Narrows, which limits the amount of water that can cross the sections and
forces a vertical recirculation. This results in a complex spatio-temporal pattern of
vertical transfers, with the sign of the net vertical transfer being opposite in each
side of the Camarinal Sill. Conversely, the mixing seems to have little influence on the heat
and salt exchanged between layers (∼2 %–10 % of advected heat and salt).
Therefore, the main point of our work is that most of the transformation of water
properties along the strait is induced by the vertical advection of heat and salt and not
by vertical mixing. A simple relationship between the net flux and the vertical transfers
of water, heat and salt is also proposed. This relationship could be used for the fine-tuning of coarse-resolution model parameterizations in the strait
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