Gabriele Casagrande - A unique coupling of the massive spin-2 field to supergravity

by Gabriele Casagrande (Ecole Polytechnique)

Wednesday May 14, 2025, 4:00 PM → 5:00 PM Europe/Paris

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Abstract: In this talk, I will discuss the coupling of a massive spin-2 field to (undeformed) D=4, N=1 supergravity. We do so by constructing the general stress-energy tensor multiplet for the N=1 massive spin-2 supermultiplet. We show that, at leading order in the Planck mass, this coupling is unique and characterized by a specific non-minimal coupling to the Riemann tensor. The massive spin-2 sector of this unique coupling reproduces the one of an oscillator mode in open string theory. The massive spin-1 sector, on the other hand, includes a higher-derivative term that may lead to violations of causality, which can be resolved by introducing infinitely many higher-spin fields, similar to the Regge trajectories in string theory. Moreover, we argue that this coupling is genuinely different from the one arising from Kaluza-Klein reductions of higher-dimensional supergravities, which we show leads instead to a deformation of the massless supersymmetry transformations.

Link: Zoom

AnLy: https://sites.google.com/view/anlystringsandfields