1998/08/20 by Gary Shiu, S.-H. Henry Tye, S. -H. Henry Tye · 2 citations
Mathematics · Physics and Astronomy · #Black Holes and Theoretical Physics #Boson #Combinatorics #Conjecture #Constant (computer programming) #Cosmological constant #Cosmology and Gravitation Theories #Degeneracy (biology) #Duality (order theory) #Fermi Gamma-ray Space Telescope #Fermion #Mathematical physics #Mathematics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum mechanics #String (physics) #Theoretical physics #hep-ph #hep-th
paper · pdf · doi:10.1016/s0550-3213(98)00775-5
published as Nucl.Phys. B542 (1999) 45-72 · Revtex 3.0, 30 pages, 6 figures, some statements are changed and some new observations are made
arxiv created 1998/08/20 · openalex publication_date 1999/03/01 · arxiv updated 2009/11/30 · openalex created_date 2020/11/23 · openalex updated_date 2026/08/05
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 Z2⊗Z2′ 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 strongweak 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.