Event time:

Thursday, September 21, 2006 - 12:30pm to Wednesday, September 20, 2006 - 8:00pm

Location:

431 DL

Speaker:

Karin Melnick

Speaker affiliation:

Yale

Event description:

Many important classes of compact manifolds, such as hyperbolic

manifolds, have paltry isometry group but abundant local symmetry. I will

present a structure theorem for compact aspherical Lorentz manifolds with

abundant local symmetry. This result is analogous to a theorem of Farb

and Weinberger on compact aspherical Riemannian manifolds. Some tools

that will be discussed are Gromov’s stratification for rigid geometric

structures and rational cohomological dimension.