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Sandra Huppert

Oberseminar Differentialgeometrie: Joel Fine (Brüssel), Vortrag: Knots, minimal surfaces and J-holomorphic curves

Monday, 18.01.2021 16:15 im Raum Zoom

Mathematik und Informatik

Zoom-Meeting: https://wwu.zoom.us/j/97461739978 Abstract: The asymptotic Plateau problem is as follows: given a submanifold K in the n-sphere, is there a minimal submanifold in (n+1)-dimensional hyperbolic space whose ideal boundary is K? I will explain how solving this problem when K is a knot (or link) in the 3-sphere leads to a knot invariant: the number of genus g minimal surfaces filling K depends on K only up to isotopy. One corollary is that any unknotted circle in the 3-sphere bounds a minimal disc in 4-dimensional hyperbolic space. In fact this count of minimal surfaces is actually an example of a Gromov-Witten type invariant: minimal surfaces in H^4 lift to J-holomorphic curves in the twistor space, which is a symplectic manifold. There is a class of infinite volume symplectic 6-manifolds, containing this twistor space, for which one can define counts of J-holomorphic curves which run out to infinity and this gives rise to more knot invariants in 3-manifolds. Finally, if there is time, I will speculate how to actually compute the invariant (and so relate it to known invariants). It appears that it should be possible to use simple combinatorics - a skein relation - to compute the invariant and so prove existence of minimal surfaces. Parts of this work are joint with Marcelo Alves.



Angelegt am 23.09.2020 von Sandra Huppert
Geändert am 13.01.2021 von Sandra Huppert
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