Compact Einstein-Weyl four-dimensional manifolds
Guy Bonneau; Guy Bonneau; Laboratoire de Physique Théorique et des Hautes Energies, Unité associée au CNRS UMR 7589, Université Paris 7, 2 Place Jussieu, 75251 Paris Cedex 05, France
Журнал:
Classical and Quantum Gravity
Дата:
1999-03-01
Аннотация:
We look for four-dimensional Einstein-Weyl spaces equipped with a regular Bianchi metric. Using the explicit four-parameter expression of the distance obtained in a previous work for non-conformally Einstein Einstein-Weyl structures, we show that only four one-parameter families of regular metrics exist on orientable manifolds: they are all of Bianchi type IX and locally conformally Kähler; moreover, in agreement with general results, they have a positive-definite conformal scalar curvature. In a Gauduchon gauge, they are compact and we obtain their topological invariants. Finally, we compare our results to the general analyses of Madsen, Pedersen, Poon and Swann: our simpler parametrization allows us to correct some of their assertions.
155.1Кб