  We derive the quantitative estimates of propagation of chaos for the large
interacting particle systems in terms of the relative entropy between the joint
law of the particles and the tensorized law of the mean field PDE. We resolve
this problem for the first time for the viscous vortex model that approximating
2D Navier-Stokes equation in the vorticity formulation on the whole space. We
obtain as key tools the Li-Yau-type estimates and Hamilton-type heat kernel
estimates for 2D Navier-Stokes in the whole space.
