79 citations · 323 across the 7 of their papers we have counts for
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hep-th2001
Chiral Fermions from Manifolds of Holonomy
Bobby Acharya, Edward Witten
M-theory compactification on a manifold X of holonomy can give chiral fermions in four dimensions only if X is singular. A number of examples of conical singularities that gi…
hep-th2001
Anomaly Cancellation On Manifolds Of G_2 Holonomy
Edward Witten
Smooth manifolds of G_2 holonomy, used to compactify M-theory to four dimensions, give only abelian gauge groups without charged matter multiplets. But singular G_2-manifolds can g…
hep-th2001
Quantum Gravity In De Sitter Space
Edward Witten
We discuss some general properties of quantum gravity in De Sitter space. It has been argued that the Hilbert space is of finite dimension. This suggests a macroscopic argument tha…