Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1997-09-05
Phys.Lett.B419:123-131,1998
Physics
High Energy Physics
High Energy Physics - Theory
14 pages. Standard Latex
Scientific paper
10.1016/S0370-2693(97)01294-X
We study the problem of baryon stability in M theory, starting from realistic four-dimensional string models constructed using the free-fermion formulation of the weakly-coupled heterotic string. Suitable variants of these models manifest an enhanced custodial gauge symmetry that forbids to all orders the appearance of dangerous dimension-five baryon-decay operators. We exhibit the underlying geometric (bosonic) interpretation of these models, which have a $Z_2 \times Z_2$ orbifold structure similar, but not identical, to the class of Calabi-Yau threefold compactifications of M and F theory investigated by Voisin and Borcea. A related generalization of their work may provide a solution to the problem of proton stability in M theory.
Ellis John
Faraggi Alon E.
Nanopoulos Dimitri V.
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