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These expository notes sketch the origins of Branson’s Q-curvature. We give an introductory account of the equations governing its prescription, its roles in a conformal action formula as well as in Polyakov-type formulae for the conformal variation of the functional determinants of suitable elliptic operators. We indicate how properties, which partly characterise the Q-curvature, identify it as an extreme case of a class of differential operators on closed differential forms; these so-called Q-operators generalise the Q-curvature.
Acta Applicandae Mathematicae – Springer Journals
Published: Apr 22, 2008
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