More On Nonrelativistic Diffeomorphism Invariance
  Certain aspects of nonrelativistic diffeomorphisms in 2+1 dimensions are investigated. These include a nonrelativistic limit of some relativistic actions in 3 dimensions, the Seiberg-Witten map, a modification of the viscosity tensor in particular due to a non-uniform magnetic field, a redefinition of background fields, and 1/R terms on Riemann surfaces of constant curvature. 
Oleg Andreev
hep-th cond-mat.mes-hall cond-mat.str-el gr-qc