MSLED: a minimal supersymmetric large extra dimensions scenario
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We propose a framework for the low-energy realization of supersymmetry which
is very predictive, but differs radically in its phenomenological implications
from the supersymmetric Standard Model (minimal or otherwise). The proposal
consists of a supersymmetric version of the Large-Extra-Dimensions scenario,
with the Standard Model living on a 3-brane, coupled to a bulk sector
consisting of six-dimensional supergravity. This picture is motivated by a
promising recent attempt (hep-th/0304256) to naturally understand the observed
dark energy density, and this connection with dark energy prevents making the
extra dimensions smaller than of order 5 $\mu$m. The resulting inability to
change this size makes the model very predictive, and easily falsifiable within
the near future. Being supersymmetric, it may plausibly be embedded into a more
fundamental theory such as string theory, in which case an additional 4 compact
dimensions may also be present having inverse radii at the TeV scale or higher.
The model is close to, but consistent with, current experimental constraints.
We outline possible phenomenological implications for particle physics (both at
accelerators and elsewhere), for precision tests of gravity, for astrophysics
and for cosmology.
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