Pursuing the double affine Grassmannian III: Convolution with affine Zastava

摘要

This is the third paper of a series (started by arXiv:0711.2083,arXiv:0908.3390) which describes a conjectural analog of the affineGrassmannian for affine Kac-Moody groups (also known as the double affineGrassmannian). The current paper is dedicated to describing a conjecturalanalog of the convolution diagram for the double affine Grassmannian and affineZastava.