Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2001-09-19
Physics
High Energy Physics
High Energy Physics - Theory
26 pages
Scientific paper
M-theory compactification on a manifold X of $G_2$ holonomy can give chiral fermions in four dimensions only if X is singular. A number of examples of conical singularities that give chiral fermions are known; the present paper is devoted to describing some additional examples. In some of them, the physics can be determined but the metric is not known explicitly, while in others the metric can be described explicitly but the physics is more challenging to understand.
Acharya Bobby
Witten Edward
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