Results 21 to 30 of about 547 (42)

Simple conformally recurrent space-times are conformally recurrent PP-waves

, 2017
We show that in dimension n>3 the class of simple conformally recurrent space-times coincides with the class of conformally recurrent pp-waves.Comment: Dedicated to the memory of professor Witold ...
Mantica, Carlo Alberto, Molinari, Luca Guido   +1 more
core   +1 more source

Linear Connections on Normal Almost Contact Manifolds with Norden Metric [PDF]

, 2010
Families of linear connections are constructed on almost contact manifolds with Norden metric. An analogous connection to the symmetric Yano connection is obtained on a normal almost contact manifold with Norden metric and closed structural 1-form.
Teofilova, Marta
core   +2 more sources

On the $r-$stability of spacelike hypersurfaces

, 2009
In this paper we study the strong stability of spacelike hypersurfaces with constant $r$-th mean curvature in Generalized Robertson-Walker spacetimes of constant sectional curvature.
A. Caminha, Alías, Alías, Barbosa, Barbosa, Barbosa, Barbosa, Barros, Barros, Brasil, Caminha, F. Camargo, H. de Lima, Liu, M. da Silva, Montiel, O’Neill, Xin   +17 more
core   +1 more source

Symmetry and pseudosymmetry properties with Ricci soliton of the Reissner-Nordström-de Sitter spacetime

Nuclear Physics B
The primary objective of the article is to investigate the symmetry and pseudosymmetry properties of the Reissner-Nordström-de Sitter (briefly, RNdS) spacetime. The secondary aim of the paper is to explore the notion of Ricci solitons in RNdS spacetimes.
Absos Ali Shaikh, Kamiruzzaman
doaj   +1 more source

Isophote curves on timelike surfaces in Minkowski 3-space

, 2012
Isophote comprises a locus of the surface points whose normal vectors make a constant angle with a fixed vector. In this paper, isophote curves are studied on timelike surfaces in Minkowski 3-space E31.
Ali, Ali, Dillen, Dillen, Dillen, Dillen, Doğan, Doğan, Doğan, Doğan, Izumiya, Izumiya, Johannes Kepler, Johannes Kepler, Kim, Kim, Kühnel, Kühnel, Neill, Neill, Nistor, Nistor, Poeschl, Poeschl, Ratcliffe, Ratcliffe   +25 more
core   +1 more source

On tangent bundles of Walker four-manifolds

Open Mathematics
The aim of this study is to explore the complete lifts of almost Norden structures on tangent bundles of Walker four-manifolds. Furthermore, we examine the integrability conditions of the complete lifts JC{J}^{C} of the proper almost complex structure ...
Çayir Haşim, Güler Erkan, Köseoğlu Gökhan   +2 more
doaj   +1 more source

Timelike Bertrand Curves in Semi-Euclidean Space [PDF]

, 2010
In this paper, it is proved that, no special timelike Frenet curve is a Bertrand curve in $\mathbb{E}_2^4$ and also, in $\mathbb{E}_\nu^{n+1}$ $ ({n \ge 3})$, such that the notion of Bertrand curve is definite only in $\mathbb{E}_1^2$ and $\mathbb{E}_1^3$
Ersoy, Soley, Tosun, Murat
core  

Null Distance and Convergence of Lorentzian Length Spaces. [PDF]

Ann Henri Poincare, 2022
Kunzinger M, Steinbauer R.
europepmc   +1 more source

Polyharmonic hypersurfaces into pseudo-Riemannian space forms. [PDF]

Ann Mat Pura Appl, 2023
Branding V, Montaldo S, Oniciuc C, Ratto A.   +3 more
europepmc   +1 more source

The Singularity Theorems of General Relativity and Their Low Regularity Extensions. [PDF]

Jahresber Dtsch Math Ver, 2023
Steinbauer R.
europepmc   +1 more source