The Quarterly Journal of Mathematics Advance Access originally published online on July 11, 2007
The Quarterly Journal of Mathematics 2007 58(4):443-462; doi:10.1093/qmath/ham030
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FOUR-DIMENSIONAL CONFORMAL C-SPACES


Department of Mathematics, University of Auckland, Private Bag 92019, Auckland, New Zealand
Corresponding author. E-mail: gover{at}math.auckland.ac.nz
Received 21 February 2007;
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We investigate the structure of conformal C-spaces, a class of Riemannian manifolds which naturally arises as a conformal generalization of the Einstein condition. A basic question is when such a structure is closed, or equivalently locally conformally Cotton. In dimension four, we obtain a full answer to this question and also investigate the incidence of the Bach condition on this class of metrics. This is related to earlier results obtained in the Einstein–Weyl context.
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