346 research outputs found
Localization of gauge bosons in the 5D standing wave braneworld
We investigate the problem of localization of gauge fields within the 5D
standing wave braneworld model and show that in the case of increasing warp
factor there exist normalizable vector field zero modes on the brane.Comment: The version accepted by Phys. Lett. B, 8 pages, 1 figure
Acceleration of a Spherical Brane-Universe
The model where the universe is considered as an expanding spherical 3-brane
allows us to explain its expansion rate without a dark energy component. In
this scenario the computed redshift that corresponds to the transition from
cosmic deceleration to acceleration is in a good agreement with observations.Comment: The version accepted by Phys. Lett.
Localization of Matter Fields in the 5D Standing Wave Braneworld
We investigate the localization problem of matter fields within the 5D
standing wave braneworld. In this model the brane emits anisotropic waves into
the bulk with different amplitudes along different spatial dimensions. We show
that in the case of increasing warp factor there exist the pure gravitational
localization of all kinds of quantum and classical particles on the brane. For
classical particles the anisotropy of the background metric is hidden, brane
fields exhibit standard Lorentz symmetry in spite of anisotropic nature of the
primordial 5D metric.Comment: The version accepted by JHE
Brane-Universe in Six Dimensions
Growing non-singular solution of 6-dimensional Einstein equations for the
4-brane in infinite transversal 2-space is found. This solution provides
gravitational trapping of matter and 4-dimensional gravity on the brane without
extra delta-like source. The suitable solution exists in the case of the
(2+4)-space and not exists for the (1+5)-signature.Comment: Version accepted in Phys.Lett. B. Minor correction
Speed Limit on the brane
Relationship between the speed limit on the brane and in the bulk is
discussed. We assume that the speed of light, similar to the 4-dimensional
gravitational constant, is not a primary fundamental constant but depends on
the gravitational potential of the brane. This opens the way to explain the
hierarchy between the Plank and Higgs scales even within the simplest
5-dimensional model.Comment: RevTeX, 2 pages, no figure
Electroweak Phase Transitions in Einstein's Static Universe
We suggest using Einstein's static universe metric for the metastable state
after reheating, instead of the Friedman-Robertson-Walker spacetime. In this
case strong static gravitational potential leads to the effective reduction of
the Higgs vacuum expectation value, which is found to be compatible with the
Standard Model first order electroweak phase transition conditions. Gravity
could also increase the CP-violating effects for particles that cross the new
phase bubble walls and thus is able to lead to the successful electroweak
baryogenesis scenario.Comment: The published versio
Octonionic Geometry
We extend vector formalism by including it in the algebra of split octonions,
which we treat as the universal algebra to describe physical signals. The new
geometrical interpretation of the products of octonionic basis units is
presented. Eight real parameters of octonions are interpreted as the space-time
coordinates, momentum and energy. In our approach the two fundamental
constants, and , have the geometrical meaning and appear from the
condition of positive definiteness of the octonion norm. We connect the
property of non-associativity with the time irreversibility and fundamental
probabilities in physics.Comment: 11 pages, no figure
Localization of scalar and tensor fields in the standing wave braneworld with increasing warp factor
We investigate scalar and tensor fields in the brane model solution for the
5D space-time with standing gravitational waves in the bulk and show that even
in the case of increasing warp factor there exist normalizable zero modes
localized on the brane.Comment: The version accepted by Phys. Lett. B, 11 pages, 2 figure
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