Results 81 to 90 of about 341 (179)

Biharmonic pseudo-Riemannian submersions from 3-manifolds

Filomat, 2018
We classify the pseudo-Riemannian biharmonic submersion from a 3-dimensional space form onto a surface.
MURATHAN, CENGİZHAN, Erken, Irem Kupeli
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Geodesically Complete Lorentzian Metrics on Some Homogeneous 3 Manifolds

Symmetry, Integrability and Geometry: Methods and Applications, 2008
In this work it is shown that a necessary condition for the completeness of the geodesics of left invariant pseudo-Riemannian metrics on Lie groups is also sufficient in the case of 3-dimensional unimodular Lie groups, and not sufficient for 3 ...
Alberto Medina, Shirley Bromberg
doaj   +1 more source

G2(2)∗-structures on pseudo-Riemannian manifolds [PDF]

Journal of Geometry and Physics, 1998
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Ricci–Bourguignon Almost Solitons with Special Potential on Sasaki-like Almost Contact Complex Riemannian Manifolds

Mathematics
Almost contact complex Riemannian manifolds, also known as almost contact B-metric manifolds, are equipped with a pair of pseudo-Riemannian metrics that are mutually associated with each other using the tensor structure. Here, we consider a special class
Mancho Manev
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Pair of Associated η-Ricci–Bourguignon Almost Solitons with Vertical Potential on Sasaki-like Almost Contact Complex Riemannian Manifolds

Mathematics
The manifolds studied are almost contact complex Riemannian manifolds, known also as almost contact B-metric manifolds. They are equipped with a pair of pseudo-Riemannian metrics that are mutually associated to each other using an almost contact ...
Mancho Manev
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Solutions of Helmholtz and Schrödinger Equations with Side Condition and Nonregular Separation of Variables

Symmetry, Integrability and Geometry: Methods and Applications, 2012
Olver and Rosenau studied group-invariant solutions of (generally nonlinear) partial differential equations through the imposition of a side condition. We apply a similar idea to the special case of finite-dimensional Hamiltonian systems, namely Hamilton-
Philip Broadbridge, Claudia M. Chanu, Willard Miller Jr.   +2 more
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Pseudo-timelike loops in signature changing semi-Riemannian manifolds with a transverse radical

Results in Physics
In 1983, Hartle and Hawking proposed the no-boundary proposal, suggesting that the universe has no beginning in the sense of a spacetime singularity or boundary. Nevertheless, there is an origin of time.
N.E. Rieger, W. Hasse
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Einstein connection of nonsymmetric pseudo-Riemannian manifold

A.~Einstein considered  a nonsymmetric (0,2)-tensor $G=g+F$, where $g$ is a pseudo-Riemannian metric and $F\ne0$ is skew-symmetric, and a linear connection $\nabla$ with torsion $T$ such that $(\nabla_X\,G)(Y,Z)=-G(T(X,Y),Z)$. M. Prvanovi\'c (1995) obtained the explicit form of the Einstein connection of an almost Hermitian manifold.
Milan Zlatanovic, Vladimir Rovenski
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Eigenvalues of Killing Tensors and Separable Webs on Riemannian and Pseudo-Riemannian Manifolds

Symmetry, Integrability and Geometry: Methods and Applications, 2007
Given a $n$-dimensional Riemannian manifold of arbitrary signature, we illustrate an algebraic method for constructing the coordinate webs separating the geodesic Hamilton-Jacobi equation by means of the eigenvalues of $m leq n$ Killing two-tensors ...
Giovanni Rastelli, Claudia Chanu
doaj  

Einstein Gravity, Lagrange-Finsler Geometry, and Nonsymmetric Metrics

Symmetry, Integrability and Geometry: Methods and Applications, 2008
We formulate an approach to the geometry of Riemann-Cartan spaces provided with nonholonomic distributions defined by generic off-diagonal and nonsymmetric metrics inducing effective nonlinear and affine connections.
Sergiu I. Vacaru
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