Isometric Actions and Harmonic Morphisms

نویسنده

  • RADU PANTILIE
چکیده

We give the necessary and suucient condition for a Riemannian foliation, of arbitrary dimension, locally generated by Killing elds to produce harmonic morphisms. Natural constructions of harmonic maps and morphisms are thus obtained.

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

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Conformal Actions and Harmonic Morphisms

We give necessary and suucient conditions for a conformal foliation locally generated by conformal vector elds to produce harmonic morphisms. Natural constructions of harmonic maps and morphisms are thus obtained. Also we obtain reducibility results for harmonic morphisms induced by (innnitesimal) conformal actions on Einstein manifolds.

متن کامل

C:/Documents and Settings/Jonas/Mina dokument/Matematik master/Rapport/master-jonasn.dvi

In this thesis we investigate the existence of complex-valued harmonic morphisms on Lie groups and homogeneous Hadamard manifolds. The Lie groups that we are interested in have a particular decomposition of their Lie algebra. This decomposition allows us to define harmonic morphisms to R, n ≥ 2. Any homogeneous Hadamard manifold is isometric to a solvable Lie group S with a left-invariant metri...

متن کامل

Topological Restrictions for Circle Actions and Harmonic Morphisms

Let M be a compact oriented smooth manifold which admits a smooth circle action with isolated fixed points which are isolated as singularities as well. Then all the Pontryagin numbers of M are zero and its Euler number is nonnegative and even. In particular, M has signature zero. We apply this to obtain non-existence of harmonic morphisms with one-dimensional fibres from various domains, and a ...

متن کامل

The category of generalized crossed modules

In the definition of a crossed module $(T,G,rho)$, the actions of the group $T$ and $G$ on themselves are given by conjugation. In this paper, we consider these actions to be arbitrary and thus generalize the concept of ordinary crossed module. Therefore, we get the category ${bf GCM}$, of all generalized crossed modules and generalized crossed module morphisms between them, and investigate som...

متن کامل

Minimality and Harmonicity in Differential Geometry

The theory of minimal surfaces and more generally of minimal immersions is one of the most fashionable branches in Diierential Geometry. Since the very early stage of the theory it was clear that there was a strong link between minimality and harmonicity. From a relation of E. Beltrami 4] follows that a surface in R 3 is minimal if and only if the components of the position vector are harmonic ...

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

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

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 1999