4 research outputs found
D-dimensional Randall-Sundrum models from Brans-Dicke theory and Kaluza-Klein modes
We investigate the spectroscopy of scalar and vector Kaluza-Klein modes that
arise in a deformed Randall-Sundrum model that is constructed from Brans-Dicke
theory. The non-minimal coupling in the Brans Dicke theory translates into a
deformation of the Randall-Sundrum geometry that depends on the Brans-Dicke
parameter . We find that the parameter has a non-trivial
effect in the spectroscopy of scalar and vector Kaluza-Klein modes. Our results
suggest the interpretation of as a fine-tuning parameter.Comment: 16 pages, 5 figures. Fig. 5 was corrected. We added new physical
discussion
Higher order dilaton gravity: brane equations of motion in the covariant formulation
Dilaton gravity with general brane localized interactions is investigated.
Models with corrections up to arbitrary order in field derivatives are
considered. Effective gravitational equations of motion at the brane are
derived in the covariant approach. Dependence of such brane equations on the
bulk quantities is discussed. It is shown that the number of the bulk
independent brane equations of motion depends strongly on the symmetries
assumed for the model and for the background. Examples with two and four
derivatives of the fields are presented in more detail.Comment: 32 pages, references added, discussion extended, typos corrected,
version to be publishe
Holographic methods and gauge-Higgs unification in flat extra dimensions
I review the holographic techniques used to efficiently study models with
Gauge-Higgs Unification (GHU) in one extra dimension. The general features of
GHU models in flat extra dimensions are then reviewed, emphasizing the aspects
related to electroweak symmetry breaking. Two potentially realistic models,
based on SU(3) and SO(5) electroweak gauge groups, respectively, are
constructed.Comment: Invited contribution to the New Journal of Physics Focus Issue on
'Extra Space Dimensions', 43 pages; v2: minor corrections and improvements;
v3: matches journal versio