Informal Geometric Analysis Seminar

Title: Bubble tree convergence of conformally cross product preserving maps
Speaker: Da Rong Cheng
Speaker Info: University of Chicago
Brief Description:
Special Note:

We study a class of weakly conformal 3-harmonic maps, called Smith maps, which parametrize associative 3-folds in 7-manifolds equipped with G2-structures. These maps satisfy a first-order system of PDEs generalizing the Cauchy-Riemann equation for J-holomorphic curves, and we are interested in their bubbling phenomena. Specifically, we present an epsilon-regularity theorem for Smith maps in W^{1, 3}, and then explain how that combines with conformal invariance to yield bubble trees of Smith maps from sequences of such maps with uniformly bounded 3-energy. When the G2-structure is closed, we show that both 3-energy and homotopy are preserved in the bubble tree limit. The result can be viewed as an associative analogue of the bubble tree convergence theorem for J-holomorphic curves. This is joint work with Spiro Karigiannis and Jesse Madnick.
Date: Thursday, November 14, 2019
Time: 03:00pm
Where: Lunt 107
Contact Person: Ben Weinkove
Contact email: weinkove@math.northwestern.edu
Contact Phone:
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