734 research outputs found
Non-Compact Universe with Parallel Positive Tension 3-Branes
We construct the general model with only parallel positive tension 3-branes
on and . The cosmology constant is
sectional constant along the fifth dimension. In this general scenario, the
5-dimensional GUT scale on each brane can be indentified as the 5-dimensional
Planck scale, but, the 4-dimensional Planck scale is generated from the low
4-dimensional GUT scale exponentially in our world. We also give two simple
models to show explicitly how to solve the gauge hierarchy problem.Comment: 9 pages, Latex, minor change and add reference
Group manifold approach to higher spin theory
We consider the group manifold approach to higher spin theory. The deformed
local higher spin transformation is realized as the diffeomorphism
transformation in the group manifold . With the suitable rheonomy
condition and the torsion constraint imposed, the unfolded equation can be
obtained from the Bianchi identity, by solving which, fields in
are determined by the multiplet at one point, or equivalently, by
in . Although the
space is extended to to get the geometrical formulation, the
dynamical degrees of freedom are still in . The equations of
motion for are obtained by plugging the rheonomy
condition into the Bianchi identity. The proper rheonomy condition allowing for
the maximum on-shell degrees of freedom is given by Vasiliev equation. We also
discuss the theory with the global higher spin symmetry, which is in parallel
with the WZ model in supersymmetry.Comment: 35 pages,v2: revised version, v3: 38 pages, improved discussion on
global HS symmetry, clarifications added in appendix B, journal versio
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