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
中科院分区:
文献类型:
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作者:
I. Vaisman
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.
DOI:
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发表时间:
2006
期刊:
Journal of Mathematical Physics Vol. 47
影响因子:
--
作者:
Y. Giga;N. Umeda;H.Urakawa;H.Urakawa
通讯作者:
H.Urakawa
DOI:
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发表时间:
2016
期刊:
影响因子:
--
作者:
Kohno;K.;Y. Tonegawa;Tomoyoshi Ibukiyama
通讯作者:
Tomoyoshi Ibukiyama