Higgs and super-Higgs effects with naturally vanishing vacuum energy

Details Higgs and super-Higgs effects with naturally vanishing vacuum energy Higgs and super-Higgs effects with naturally vanishing vacuum energy

1995-04-06

arxiv.org/abs/hep-th/9504032v1

Phys.Lett. B356 (1995) 500-508

Physics

High Energy Physics

High Energy Physics - Theory

14 A4 pages, no figures, plain LATEX (no special macros, to be run twice)

Scientific paper

10.1016/0370-2693(95)00882-L

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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