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math.DG2003
CR Invariant powers of the sub-Laplacian
A. Rod Gover, C. Robin Graham
CR invariant differential operators on densities with leading part a power of the sub-Laplacian are derived. One family of such operators is constructed from the ``conformally inva…
math.DG2001
Q-Curvature and Poincare Metrics
Charles Fefferman, C. Robin Graham
This article presents a new definition of Branson's Q-curvature in even-dimensional conformal geometry. We derive the Q-curvature as a coefficient in the asymptotic expansion of th…