Linear Versus Non-linear Supersymmetry, in General

Understand

We study superconformal and supergravity models with constrained superfields.

• The underlying version of such models with all unconstrained superfields and linearly realized supersymmetry is presented here, in addition to the physical multiplets there are Lagrange multiplier (LM) superfields.
• Once the equations of motion for the LM superfields are solved, some of the physical superfields become constrained.
• The linear supersymmetry of the original models becomes non-linearly realized, its exact form can be deduced from the original linear supersymmetry.