Results 21 to 30 of about 30,853 (255)

AFFINE KILLING REEB VECTOR FIELD FOR A REAL HYPERSURFACE IN THE COMPLEX QUADRIC [PDF]

open access: yes
In this paper, first we introduce a general notion of affine Killing vector fields on the complex quadric Q^m, which is weaker than usual Killing vector field.
Kim, Gyu Jong   +2 more
core   +3 more sources

Weakly charged generalized Kerr–NUT–(A)dS spacetimes

open access: yesPhysics Letters B, 2017
We find an explicit solution of the source free Maxwell equations in a generalized Kerr–NUT–(A)dS spacetime in all dimensions. This solution is obtained as a linear combination of the closed conformal Killing–Yano tensor hab, which is present in such a ...
Valeri P. Frolov   +2 more
doaj   +1 more source

On the Tachibana numbers of closed manifolds with pinched negative sectional curvature

open access: yesДифференциальная геометрия многообразий фигур, 2020
Conformal Killing form is a natural generalization of con­formal Killing vector field. These forms were exten­si­vely studied by many geometricians. These considerations we­re motivated by existence of various applications for the­se forms.
S.E. Stepanov, I. I. Tsyganok
doaj   +1 more source

On the Lie subalgebra of Killing-Milne and Killing-Cartan vector fields in Newtonian space-time [PDF]

open access: yes, 2014
The Galilean (and more generally Milne) invariance of Newtonian theory allows for Killing vector fields of a general kind, whereby the Lie derivative of a field is not required to vanish but only to be cancellable by some infinitesimal Galilean ...
Chamel, Nicolas
core   +1 more source

Periodic geodesics and geometry of compact Lorentzian manifolds with a Killing vector field [PDF]

open access: yes, 2011
We study the geometry and the periodic geodesics of a compact Lorentzian manifold that has a Killing vector field which is timelike somewhere. Using a compactness argument for subgroups of the isometry group, we prove the existence of one timelike non ...
JAVALOYES, Miguel Angel   +5 more
core   +1 more source

A New Class of Contact Pseudo Framed Manifolds with Applications

open access: yesInternational Journal of Mathematics and Mathematical Sciences, 2021
In this paper, we introduce a new class of contact pseudo framed (CPF)-manifolds M,g,f,λ,ξ by a real tensor field f of type 1,1, a real function λ such that f3=λ2f where ξ is its characteristic vector field. We prove in our main Theorem 2 that M admits a
K. L. Duggal
doaj   +1 more source

2-Killing vector fields on warped product manifolds [PDF]

open access: yes, 2015
This paper provides a study of 2-Killing vector fields on warped product manifolds as well as characterization of this structure on standard static and generalized Robertson-Walker space-times.
Sameh Shenawy   +3 more
core   +1 more source

Conformal and Disformal Structure of 3D Circularly Symmetric Static Metric in f(R) Theory of Gravity

open access: yesMehran University Research Journal of Engineering and Technology, 2020
conformal vector fields are treated as generalization of homothetic vector fields while disformal vector fields are defined through disformal transformations which are generalization of conformal transformations, therefore it is important to study ...
Muhammad Ramzan   +2 more
doaj   +1 more source

Light-cone quantization of scalar field on time-dependent backgrounds

open access: yesEuropean Physical Journal C: Particles and Fields, 2022
We discuss what is light-cone quantization on a curved spacetime also without a null Killing vector. Then we consider as an example the light-cone quantization of a scalar field on a background with a Killing vector and the connection with the second ...
Andrea Arduino, Igor Pesando
doaj   +1 more source

Pseudo-Riemannian Lie groups admitting left-invariant conformal vector fields

open access: yesComptes Rendus. Mathématique, 2020
Let $G$ be a Lorentzian Lie group or a pseudo-Riemannian Lie group of type $(n-2,2)$. If $G$ admits a non-Killing left-invariant conformal vector field, then $G$ is solvable.
Zhang, Hui, Chen, Zhiqi
doaj   +1 more source

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