3,493 research outputs found
Nonlinear Realization of Supersymmetric AdS Space Isometries
The isometries of space and supersymmetric space
are nonlinearly realized on four dimensional Minkowski space. The resultant
effective actions in terms of the Nambu-Goldstone modes are constructed. The
dilatonic mode governing the motion of the Minkowski space probe brane into the
covolume of supersymmetric space is found to be unstable and the bulk
of the space is unable to sustain the brane. No such instablility
appears in the non-supersymmetric case.Comment: 18 page
Nonlinear Realization of Supersymmetry and Superconformal Symmetry
Nonlinear realizations describing the spontaneous breakown of supersymmetry
and R symmetry are constructed using the Goldstino and R axion fields. The
associated R current, supersymmetry current and energy-momentum tensor are
shown to be related under the nonlinear supersymmetry transformations.
Nonlinear realizations of the superconformal algebra carried by these degrees
of freedom are also displayed. The divergences of the R and dilatation currents
are related to the divergence of the superconformal currents through nonlinear
supersymmetry transformations which in turn relates the explicit breakings of
these symmetries.Comment: 22 pages, LaTe
The Supercurrent In Supersymmetric Field Theories
A supercurrent superfield whose components include a conserved
energy-momentum tensor and supersymmetry current as well as a (generally
broken) R-symmetry current is constructed for a generic effective N=1
supersymmetric gauge theory. The general form of the R-symmetry breaking is
isolated. Included within the various special cases considered is the
identification of those models which exhibit an unbroken R-symmetry. One such
example corresponds to a non-linearly realized gauge symmetry where the chiral
field R-weight is required to vanish.Comment: 26 pages, LaTe
Twisted Boundary Conditions and Matching to the Effective Four Dimensional Theory
Nontrivial twisted boundary conditions associated with extra compact
dimensions produce an ambiguity in the value of the four dimensional coupling
constants of the renormalizable interactions of the twisted fields' zero modes.
Resolving this indeterminancy would require a knowledge of the exact form of
the higher dimensional action including the coefficients of higher dimensional
operators. For the case of moderately sized extra dimensions, the uncertainty
in the coupling constants can be of order one and may lead to modifications in
the stability of the model.Comment: 8 pages, REVTe
Supersymmetric multi-Higgs doublet model with non-linear electroweak symmetry breaking
The electroweak symmetry is nonlinearly realized in an extension of the
minimal supersymmetric standard model (MSSM) through an additional pair of
constrained Higgs doublet superfields. The superpotential couplings of this
constrained Higgs doublet pair to the MSSM Higgs doublet pair catalyze their
vacuum expectation values. The Higgs and Higgsino-gaugino mass spectrum is
presented for several choices of supersymmetry (SUSY) breaking and Higgs
superpotential mass parameters. The additional vacuum expectation values
provided by the constrained fields can produce a phenomenology quite different
than that of the MSSM .Comment: 41 pages, 16 figure
On Local Dilatation Invariance
The relationship between local Weyl scaling invariant models and local
dilatation invariant actions is critically scrutinized. While actions invariant
under local Weyl scalings can be constructed in a straightforward manner,
actions invariant under local dilatation transformations can only be achieved
in a very restrictive case. The invariant couplings of matter fields to an
Abelian vector field carrying a non-trivial scaling weight can be easily built,
but an invariant Abelian vector kinetic term can only be realized when the
local scale symmetry is spontaneously broken.Comment: 3 page
- …