Spectral estimates for the Heisenberg Laplacian on cylinders
  We study Riesz means of eigenvalues of the Heisenberg Laplacian with Dirichlet boundary conditions on a cylinder in dimension three. We obtain an inequality with a sharp leading term and an additional lower order term. 
Hynek Kovarik, Bartosch Ruszkowski, Timo Weidl
math-ph math.MP math.SP