40 citations · 59 across the 3 of their papers we have counts for
3 papers
math.DG2003★ 40 cited
Ricci-corrected derivatives and invariant differential operators
David M. J. Calderbank, Tammo Diemer, Vladimir Soucek
We introduce the notion of Ricci-corrected differentiation in parabolic geometry, which is a modification of covariant differentiation with better transformation properties. This e…
math.DG2000★ 8 cited
Differential invariants and curved Bernstein-Gelfand-Gelfand sequences
David M. J. Calderbank, Tammo Diemer
We give a simple construction of the Bernstein-Gelfand-Gelfand sequences of natural differential operators on a manifold equipped with a parabolic geometry. This method permits us…
gr-qc1999★ 11 cited
Charge and the topology of spacetime
Tammo Diemer, Mark J Hadley
A new class of electrically charged wormholes is described in which the outer two sphere is not spanned by a compact coorientable hypersurface. These wormholes can therefore displa…