Results 131 to 140 of about 20,711 (219)

Semi-Riemannian submersions with totally geodesic fibres

open access: yes, 2004
We classify semi-Riemannian submersions with connected totally geodesic fibres from a real pseudo-hyperbolic space onto a semi-Riemannian manifold under the assumption that the dimension of the fibres is less than or equal to three.
Baditoiu, Gabriel
core  

Geodesics and Deformed Pseudo-Riemannian Manifolds with Symmetry

open access: yes, 2001
There is a general method, applicable in many situations, whereby a pseudo-Riemannian metric, invariant under the action of some Lie group, can be deformed to obtain a new metric whose geodesics can be expressed in terms of the geodesics of the old ...
Hebda, James J.
core  

Galaxy Evolution with Manifold Learning. [PDF]

open access: yesEntropy (Basel)
Takeuchi TT, Cooray S, Kano RR.
europepmc   +1 more source

Conformally invariant metrics in pseudo-riemannian geometry

open access: yes
Nous nous intéressons aux variétés munies d’une classe conforme de métriques pseudo-riemanniennes, dites variétés conformes. Ces variétés apparaissent naturelle- ment dans la théorie de la relativité pour l’étude de la structure causale des espace-temps ...
Chalumeau, Adam
core  

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