Unconventional particle behaviours in supersymmetric theories and gravity

Abstract : We will first focus on supersymmetric theories with Dirac Gaugino masses. We investigate two advantages of such models. First, the possibility to reconcile the measured Higgs mass with an arbitrary large scale of supersymmetry breaking. Second, we show how the scalar singlet present in such models is a sound candidate for a resonance explaining the 750 GeV diphoton excess observed by the LHC experiments. In a second part, we start by discussing the propagation of a massive spin 3/2 state in a fluid (for instance the gravitino when supergravity is coupled to a background fluid). We show that the degrees of freedom corresponding to different helicities travel with different velocities. We then discuss the separate issue of graviton speed in extended gravity theories where the usual Einstein-Hilbert Lagrangian is supplemented by various higher order terms constructed from Riemann tensors.
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Luc Darmé. Unconventional particle behaviours in supersymmetric theories and gravity. High Energy Physics - Theory [hep-th]. Université Pierre et Marie Curie - Paris VI, 2016. English. ⟨NNT : 2016PA066161⟩. ⟨tel-01402999⟩

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