Special Colloquium
Yi Liu
Caltech
A characterization of virtually embedded subsurfaces in 3-manifolds
Abstract: In this talk, I will discuss a topological characterization of the
separability of surface subgroups in 3-manifold groups. The
characterization generalizes some earlier work of Rubinstein--Wang using
special cubulation techniques due to Daniel Wise. For surface bundles
whose monodromy has a nontrivial fractional Dehn twist coefficient,
we can construct essentially immersed but not virtually embedded closed
subsurfaces. This gives rise to new examples of non-separable surface
subgroups in many non-geometric 3-manifolds.
There is a Meet & Greet Tea right after the talk in SEO 300.
Monday January 12, 2015 at 3:00 PM in SEO 636