Quasi-Sasakian structures of rank $2p+1$

نویسندگان

چکیده

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Hypercomplex Structures from 3-Sasakian Structures

This paper describes certain hypercomplex manifolds as circle V-bundles over 3-Sasakian orbifolds. Our techniques involve both 3-Sasakian and hypercomplex reduction. In general dimension most of the quotients exist only as hypercomplex orbifolds; however, we construct a large family of compact simply connected smooth 8-manifolds whose second integral homology group is free with arbitrary rank. ...

متن کامل

Positive Sasakian Structures on 5-manifolds

A quasi–regular Sasakian structure on a manifold L is equivalent to writing L as the unit circle subbundle of a holomorphic Seifert C-bundle over a complex algebraic orbifold (X,∆ = ∑ (1− 1 mi )Di). The Sasakian structure is called positive if the orbifold first Chern class c1(X) − ∆ = −(KX + ∆) is positive. We are especially interested in the case when the Riemannian metric part of the Sasakia...

متن کامل

Sasakian-einstein Structures on 9#(s

Recently Demailly and Kóllar have developed some new techniques to study the existence of Kähler-Einstein metrics on compact Fano orbifolds [DK]. Johnson and Kóllar applied these techniques to study Kähler-Einstein metrics on certain log del Pezzo surfaces in weighted projective 3-spaces [JK1] as well as anti-canonically embedded orbifold Fano 3-folds in weighted projective 4-spaces [JK2]. In [...

متن کامل

Spin-orbit relaxation of Cl(2P1/2) and F(2P1/2) in a gas of H2.

The authors present quantum scattering calculations of rate coefficients for the spin-orbit relaxation of F(2P1/2) atoms in a gas of H2 molecules and Cl(2P1/2) atoms in a gas of H2 and D2 molecules. Their calculation of the thermally averaged rate coefficient for the electronic relaxation of chlorine in H2 agrees very well with an experimental measurement at room temperature. It is found that t...

متن کامل

Sasakian-einstein Structures on 9#(s 2 S 3 )

We show that #9(S 2 S 3) admits an 8-dimensional complex family of inequivalent non-regular Sasakian-Einstein structures. These are the rst known Einstein metrics on this 5-manifold. In particular, the bound b 2 (M)8 which holds for any regular Sasakian-Einstein M does not apply to the non-regular case. We also discuss the failure of the Hitchin-Thorpe inequality in the case of 4-orbifolds and ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Journal of Differential Geometry

سال: 1971

ISSN: 0022-040X

DOI: 10.4310/jdg/1214429995