Cluster Algebras and Exact Lagrangian Surfaces
Hot Topics: Cluster algebras and wall-crossing March 28, 2016 - April 01, 2016
Location: SLMath: Eisenbud Auditorium
Lagrangian Floer homology
Microlocal analysis
microlocal sheaves
Kashiwara-Schapira
symplectic 4-manifolds
families of Lagrangian subspaces
13P10 - Gröbner bases; other bases for ideals and modules (e.g., Janet and border bases)
14K22 - Complex multiplication and abelian varieties [See also 11G15]
14K25 - Theta functions and abelian varieties [See also 14H42]
34G20 - Nonlinear differential equations in abstract spaces [See also 34K30, 47Jxx]
14J50 - Automorphisms of surfaces and higher-dimensional varieties
14489
We explain a general relationship between cluster theory and the classification of exact Lagrangian surfaces in Weinstein 4-manifolds. A key point is the introduction of an operation on singular Lagrangian skeleta which geometrizes the notion of quiver mutation. This lets us produce large classes of exact Lagrangians labeled by clusters in an associated cluster algebra. When the manifold in question is a cotangent bundle and the exact Lagrangians fill a suitable Legendrian knot in its contact boundary, the microlocalization theory of Kashiwara-Schapira recovers the cluster structures on positroid strata and moduli spaces of local systems from this symplectic paradigm. This is joint with Vivek Shende and David Treumann, part of which is also joint with Eric Zaslow
H. Williams
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