Bose-Fermi Degeneracy and Duality in Non-Supersymmetric Strings

Abstract

Following Kachru, Kumar and Silverstein, we construct a set of non-supersymmetric Type II string models which have equal numbers of bosons and fermions at each mass level. The models are asymmetric {\bf Z}_2 \otimes {\bf Z}_2^{\prime} orbifolds. We demonstrate that this bose-fermi degeneracy feature implies that both the one-loop and the two-loop contributions to the cosmological constant vanish. We conjecture that the cosmological constant actually vanishes to all loops. We construct a strong-weak dual pair of models, both of which have bose-fermi degeneracy. This implies that at least some of the non-perturbative corrections to the cosmological constant are absent.

Revtex 3.0, 30 pages, 6 figures, some statements are changed and some new observations are made

References in corpus (4)

• Vacuum Energy Cancellation in a Non-supersymmetric String
• Strong/Weak Coupling Duality Relations for Non-Supersymmetric String Theories
• Duality without Supersymmetry: The Case of the SO(16)xSO(16) String
• Self-Dual Nonsupersymmetric Type II String Compactifications

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