Spontaneously broken N = 3 supergravity

Goldstino Decoupling in Spontaneously Broken Supergravity Theories

If the gravitino is sufficiently light and stable it will behave as an effective massless neutrino species at the time of nucleosynthesis. Depending on the temperature at which it decouples from the thermal bath in the early universe, the gravitino mass will be bounded by the primordial 4He abundance. Assuming a conservative estimate that the number of neutrino families, Nν < 3.6, superlight gr...

Duality and Spontaneously Broken Supergravity in Flat Backgrounds

It is shown that the super Higgs mechanism that occurs in a wide class of models with vanishing cosmological constant (at the classical level) is obtained by the gauging of a flat group which must be an electric subgroup of the duality group. If the residual massive gravitinos which occur in the partial supersymmetry breaking are BPS saturated, then the flat group is non abelian. This is so for...

Tree Unitarity Breakdown in Spontaneously Broken N=1 Supergravity Theories and Phenomenology of a Superlight Gravitino

Vacuum structure of spontaneously broken N = 2 supersymmetric gauge theory

We analyze the vacuum structure of spontaneously broken N = 2 supersymmetric gauge theory with the Fayet-Iliopoulos term. Our theory is based on the gauge group SU(2)×U(1) with Nf = 1, 2 massless quark hypermultiplets having the same U(1) charges. In the classical potential, there are degenerate vacua even in the absence of supersymmetry. It is shown that this vacuum degeneracy is smoothed out,...

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 (name...