Generalized CRF-structures

Generalized CRF-structures
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广义 CRF 结构

DOI:
10.1007/s10711-008-9239-z
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发表时间:
2007
影响因子:
0.5
通讯作者:
I. Vaisman
I. Vaisman
中科院分区:
数学4区
文献类型:
--
作者:
I. Vaisman

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一个广义F-结构是一个复的、各向同性的子矩阵Eof(度量由配对定义),使得。如果E也被Courant括号封闭,则E是一个广义CRF-结构。证明了广义F-结构与满足条件Φ3+ Φ = 0的反对称自同态Φ等价,并利用Φ的Courant-Nijenhuis挠率来表示CRF-条件.我们考虑的结构是Yano定义的F-结构和CR(Cauchy-Riemann)结构的推广。我们构造了广义CRF-结构:一个经典的F-结构,一个对,其中是TM的可积子丛,σ是M上的2-形式,一个余维h的广义正规几乎切触结构。我们证明了流形M上的广义复结构将广义CRF-结构诱导到某些子流形中。最后,我们考虑相容的广义黎曼度量,定义广义CRFK-结构,它扩展了广义Kähler结构,并且等价于四元组(γ,F+,F−,F+),其中(γ,F±)是经典的度量CRF-结构,F+是2-形式,并且某些条件可以用外微分函数和γ-Levi-Civita协变导数F+来表示。如果fd ψ= 0,则条件归结为度规γ的两个部分凯勒约化的存在。本文最后的附录中,我们定义和广义Sasakian结构的特点。
A generalized F-structure is a complex, isotropic subbundleEof(and the metric is defined by pairing) such that. IfEis also closed by the Courant bracket,Eis a generalized CRF-structure. We show that a generalized F-structure is equivalent with a skew-symmetric endomorphism Φ ofthat satisfies the condition Φ3+  Φ =  0 and we express the CRF-condition by means of the Courant-Nijenhuis torsion of Φ. The structures that we consider are generalizations of the F-structures defined by Yano and of the CR (Cauchy-Riemann) structures. We construct generalized CRF-structures from: a classical F-structure, a pairwhereis an integrable subbundle ofTMand σ is a 2-form onM, a generalized, normal, almost contact structure of codimensionh. We show that a generalized complex structure on a manifold M̃ induces generalized CRF-structures into some submanifolds. Finally, we consider compatible, generalized, Riemannian metrics and we define generalized CRFK-structures that extend the generalized Kähler structures and are equivalent with quadruples (γ,F+,F−,ψ), where (γ,F±) are classical, metric CRF-structures,ψis a 2-form and some conditions expressible in terms of the exterior differentialdψand theγ-Levi-Civita covariant derivatives ∇F±hold. Ifdψ=  0, the conditions reduce to the existence of two partially Kähler reductions of the metricγ. The paper ends by an Appendix where we define and characterize generalized Sasakian structures.
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发表时间: 2016
期刊:
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