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(25.10.) Nonlinear Supersymmetry

Chrysoula Markou (Paris)

25.10.2017 at 16:15 

In theories with at least one spontaneously broken supersymmetry, the closure of the broken supersymmetry algebra can still be observed, while it is associated with a mismatch between the fermionic and bosonic degrees of freedom at the spectrum level of the respective theory. Because of this last property, supersymmetry is said to be nonlinearly realized in such theories. Physical examples include effective models of the low-energy supersymmetry breaking, exact brane models in String Theory, as well as realizations of inflationary cosmology in the context of supergravity. The recently revived and extended constrained superfields formalism has proven to be a useful tool in studying nonlinear supersymmetry. In this talk, we discuss the latest progress that has been made in regard to the partial breaking of N=2 supersymmetry. In particular, we explain a way of achieving the partial breaking with one linearly and one nonlinearly realised supersymmetry, with the use of N=2 deformed vector and single-tensor superfields that satisfy nilpotent constraints; it turns out that the mechanism in question is in fact a version of the Super-Brout-Englert-Higgs mechanism without gravity

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