324 research outputs found
Partial Breaking of N=2 Supersymmetry and of Gauge Symmetry in the U(N) Gauge Model
We explore vacua of the U(N) gauge model with N=2 supersymmetry recently
constructed in hep-th/0409060. In addition to the vacuum previously found with
unbroken U(N) gauge symmetry in which N=2 supersymmetry is partially broken to
N=1, we find cases in which the gauge symmetry is broken to a product gauge
group \prod_{i=1}^n U(N_i). The N=1 vacua are selected by the requirement of a
positive definite Kahler metric. We obtain the masses of the supermultiplets
appearing on the N=1 vacua.Comment: 23 pages, 3 figures; references added and typos correcte
Low Energy Processes Associated with Spontaneously Broken N=2 Supersymmetry
We consider low energy processes described by the N=2 supercurrent on its
partially (to N=1) and spontaneously broken vacuum and the attendant
Nambu-Goldstone fermion (NGF), which the presence of the electric and magnetic
Fayet-Iliopoulos (FI) terms is responsible for. We show suppressions of
amplitudes decaying into the NGF as its momentum becomes small. In the
lagrangian realization (namely, the model of arXiv:hep-th/0409060) of the
conserved supercurrent, the NGF resides in the overall U(1), which is
nonetheless not decoupled, and interacts with the SU(N) sector through
nonderivative as well as derivative couplings. The low energy suppression is
instead accomplished by a cancellation between the annihilation diagram from
the Yukawa couplings and the contact four-Fermi terms. We give a complete form
of the supercurrent and the model is recast in more transparent notation.Comment: 20 pages, 6 figure
Normalization of Off-shell Boundary State, g-function and Zeta Function Regularization
We consider the model in two dimensions with boundary quadratic deformation
(BQD), which has been discussed in tachyon condensation. The partition function
of this model (BQD) on a cylinder is determined, using the method of zeta
function regularization. We show that, for closed channel partition function, a
subtraction procedure must be introduced in order to reproduce the correct
results at conformal points. The boundary entropy (g-function) is determined
from the partition function and the off-shell boundary state. We propose and
consider a supersymmetric generalization of BQD model, which includes a
boundary fermion mass term, and check the validity of the subtraction
procedure.Comment: 21 pages, LaTeX, comments and 3 new references adde
D-term Dynamical Supersymmetry Breaking Generating Split N=2 Gaugino Masses of Mixed Majorana-Dirac Type
Under a few mild assumptions, N=1 supersymmetry in four dimensions is shown
to be spontaneously broken in a self-consistent Hartree-Fock approximation of
BCS/NJL type to one-loop off-shell, in the gauge theory specified by the gauge
kinetic function and the superpotential of adjoint chiral superfields, in
particular, that possesses N=2 extended supersymmetry spontaneously broken to
N=1 at tree level. The N=2 gauginos receive mixed Majorana-Dirac masses and are
split. We derive an explicit form of the gap equation, showing the existence of
a nontrivial solution.Comment: 4 pages, the paper extended (a numerical plot of the solution to the
gap equation, an estimate of the decay rate of the metastable vacuum, and
discussion on nonvanishing term induced by the D term dynamical
supersymmetry breaking diven), references adde
U(N) Gauged N=2 Supergravity and Partial Breaking of Local N=2 Supersymmetry
We study a minimal model of U(N) gauged N=2 supergravity with one
hypermultiplet parametrizing SO(4,1)/SO(4) quaternionic manifold. Local N=2
supersymmetry is known to be spontaneously broken to N=1 in the Higgs phase of
U(1)_{graviphoton} \times U(1). Several properties are obtained of this model
in the vacuum of unbroken SU(N) gauge group. In particular, we derive mass
spectrum analogous to the rigid counterpart and put the entire effective
potential on this vacuum in the standard superpotential form of N=1
supergravity.Comment: 22 pages, a version to appear Int. J. Mod. Phys.
N=2 Quiver Gauge Model and Partial Supersymmetry Breaking
We construct an action of N=2 affine quiver gauge model having
non-canonical kinetic terms and equipped with electric and magnetic FI terms.
N=2 supersymmetry is shown to be broken to N=1 spontaneously and N=1 multiplets
realized on the vacua are given. We also mention the models with different
gauge groups. It is argued that the affine quiver gauge model provides a
dynamical realization to approach the Klebanov-Witten N=1 fixed point.Comment: 19 page
Postischemic Changes of Spirodecanone Binding in the Gerbil Hippocampus
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