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Five--Branes and Supersymmetry Breaking in M--Theory

(1999)

Authors:

Andre Lukas, Burt A Ovrut, Daniel Waldram
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Holomorphic Vector Bundles and Non-Perturbative Vacua in M-Theory

(1999)

Authors:

Ron Donagi, Andre Lukas, Burt A Ovrut, Daniel Waldram
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Chiral symmetry breaking, instantons and the ultimate quenched calculation

Nuclear Physics B - Proceedings Supplements 73:1-3 (1999) 617-619

Authors:

U Sharan, M Teper

Abstract:

We calculate the spectral density of the Dirac operator over an ensemble of configurations composed of overlapping instantons and anti-instantons. We find evidence that the spectral density diverges in the limit λ → 0. This indicates the breaking of chiral symmetry and also provides evidence that quenched QCD may be pathological in nature.
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Distinguishing J=4 from J=0 on a cubic lattice

Nuclear Physics B - Proceedings Supplements 73:1-3 (1999) 267-269

Authors:

R Johnson, M Teper
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Five-branes and supersymmetry breaking in M-theory

Journal of High Energy Physics 3:4 (1999)

Authors:

A Lukas, BA Ovrut, D Waldram

Abstract:

Supersymmetry breaking via gaugino condensation is studied in vacua of heterotic M-theory with five-branes. We show that supersymmetry is still broken by a global mechanism and that the non-perturbative superpotential takes the standard form. When expressed in terms of low energy fields, a modification arises due to a threshold correction in the gauge kinetic function that depends on five-brane moduli. We also determine the form of the low energy matter field Kahler potential. These results are used to discuss the soft supersymmetry breaking parameters, in particular the question of universality.
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