Results 41 to 50 of about 101 (97)
A Variational Approach for the Neumann Problem in Some FLRW Spacetimes
Advanced Nonlinear Studies, 2019 In this paper, we study, using critical point theory for strongly indefinite functionals, the Neumann problem associated to some prescribed mean curvature problems in a FLRW spacetime with one spatial dimension.
Bereanu Cristian, Torres Pedro J.
doaj +1 more source
Generalized Goldberg-Sachs Theorems for Pseudo-Riemannian Four-Manifolds
, 1996 [Apostolov Vestislav; Апостолов Вестислав]It has been recently observed that the Generalized Goldberg-Sachs Theorem in General Relativity as well as some of its corollaries admit appropriate Riemannian versions.
Apostolov, Vestislav
core +1 more source
, 2002 We consider forms of Chern-Simons type associated to homogeneous pseudo-Riemannian structures. The corresponding secondary classes are a measure of the lack of a homogeneous pseudo-Riemannian space to be locally symmetric.
P. M. Gadea, J. A. Oubiña
core
DUAL TIMELIKE NORMAL AND DUAL TIMELIKE SPHERICAL CURVES IN DUAL MINKOWSKI SPACE
, 2019 : In this paper, we give characterizations of dual timelike normal and dual timelike spherical curves in the dual Minkowski 3-space and we show that every dual timelike normal curve is also a dual timelike spherical curve.Keywords: Normal curves, Dual ...
ÖNDER, Mehmet
core +1 more source
Null Distance and Convergence of Lorentzian Length Spaces. [PDF]
Ann Henri Poincare, 2022 Kunzinger M, Steinbauer R.
europepmc +1 more source
Групи на ли като четиримерни специални комплексни многообразия с норденова метрика
, 2010 Марта Теофилова - Конструиран е пример на четиримерно специално комплексно многообразие с норденова метрика и постоянна холоморфна секционна кривина чрез двупара-метрично семейство от разрешими алгебри на Ли.
Teofilova, Marta
core
SEMI-RIEMANN METRİKLİ DOUBLE TANJANT DEMETİN DİFERENSİYEL GEOMETRİSİ
Süleyman Demirel Üniversitesi Fen-Edebiyat Fakültesi Fen Dergisi, 2009 Özet: Bu çalışmada, diferensiyellenebilir bir manifold üzerindeki bir semi-Riemann metriğin ikinci mertebeden tam yüseltilmesi ile elde edilen nin bir semi-Riemann metriği olduğu gösterildi ve bu metriğin Levi-Civita koneksiyonu bileşenler cinsinden
İsmet AYHAN
doaj
ON NULL CURVES ON SURFACES AND NULL VECTORS IN LORENTZ SPACE
, 2019 : In this work, we compare the Darboux frame and the Frenet frame of a null curve lying on a spacelike surface in the three-dimensional Lorentz space, and we show that the normal curvature of the curve is a constant.
ÇİFTÇİ, Ünver, ÇÖKEN, A. Ceylan
core +1 more source
A note on the Gannon-Lee theorem. [PDF]
Lett Math Phys, 2021 Schinnerl B, Steinbauer R.
europepmc +1 more source
Hyperbolic angles in Lorentzian length spaces and timelike curvature bounds. [PDF]
J Lond Math Soc, 2023 Beran T, Sämann C.
europepmc +1 more source