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Higgs and super-Higgs effects with naturally vanishing vacuum energy

Andrea Brignole·Ferruccio Feruglio·Fabio Zwirner
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Abstract

We construct $N=1$ supergravity models where the gauge symmetry and supersymmetry are both spontaneously broken, with naturally vanishing classical vacuum energy and unsuppressed Goldstino components along gauge non-singlet directions. We discuss some physically interesting situations where such a mechanism could play a role, and identify the breaking of a grand-unified gauge group as the most likely possibility. We show that, even when the gravitino mass is much smaller than the scale $m_X$ of gauge symmetry breaking, important features can be missed if we first naively integrate out the degrees of freedom of mass ${\cal O} (m_X)$, in the limit of unbroken supersymmetry, and then describe the super-Higgs effect in the resulting effective theory. We also comment on possible connections with extended supergravities and realistic four-dimensional string constructions.

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Andrea Brignole, Ferruccio Feruglio, Fabio Zwirner. 1995-04-06. Higgs and super-Higgs effects with naturally vanishing vacuum energy. https://doi.org/10.1016/0370-2693(95)00882-l

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