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Compact Hermitian surfaces of Einstein type with respect to the Hermitian connection
Authors:Georgi Ganchev  Stefan Ivanov
Institution:(1) Institute of Mathematics, Bulgarian Academy of Science, Acad. G. Bonchev Str., blok 8, 1113 Sofia, Bulgaria;(2) Faculty of Mathematics and Informatics Department of Geometry, University of Sofia, bul. James Bouchier 5, 1126 Sofia, Bulgaria
Abstract:Two Einstein-type conditions for the Hermitian curvature tensor are considered on a compact Hermitian surface: It is proved that if the symmetric part of the Ricci tensors is a scalar multiple of the metric with a negative constant, then the metric is Kaehler. If the Hermitian surface satisfies the Hermite-Einstein condition with a non positive constant, then the metric is Kaehler.Supported by Contract MM 413/1994 with the Ministry of Science and Education of Bulgaria.Supported by Contract MM 423/1994 with the Ministry of Science and Education of Bulgaria and by Contract 219/1994 with the University of Sofia ldquoSt. Kl. Ohridskirdquo.
Keywords:53C15  53C55  53B35
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