Results 41 to 50 of about 63,399 (238)
On Some Ricci Curvature Tensors in Finsler Geometry
Mediterranean Journal of Mathematics, 2023 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Sengelen Sevim, Esra +2 more
openaire +7 more sources
η-Ricci Solitons on Quasi-Sasakian Manifolds
Annals of the West University of Timisoara: Mathematics and Computer Science, 2018 The object of the present paper is to study η-Ricci solitons in a 3-dimensional non-cosymplectic quasi-Sasakian manifolds. We study a particular type of second order parallel tensor in this manifold.
Ghosh Sujit
doaj +1 more source
On the nonsymmetric purely affine gravity [PDF]
, 2007 We review the vacuum purely affine gravity with the nonsymmetric connection and metric. We also examine dynamical effects of the second Ricci tensor and covariant second-rank tensors constructed from the torsion tensor in the gravitational Lagrangian ...
Antoci S. +45 more
core +1 more source
Complete Riemannian manifolds with Killing — Ricci and Codazzi — Ricci tensors
Differential Geometry of Manifolds of Figures, 2022 The purpose of this paper is to prove of Liouville type theorems, i. e., theorems on the non-existence of Killing — Ricci and Codazzi — Ricci tensors on complete non-compact Riemannian manifolds. Our results complement the two classical vanishing theorems from the last chapter of famous Besse’s monograph on Einstein manifolds.
S.E. Stepanov, I. I. Tsyganok, J. Mikeš
openaire +2 more sources
Comparison Geometry for an Extension of Ricci Tensor [PDF]
Results in Mathematics, 2021 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Azami, Shahroud +2 more
openaire +1 more source
Ricci Curvature, Isoperimetry and a Non-additive Entropy
Entropy, 2015 Searching for the dynamical foundations of Havrda-Charvát/Daróczy/ Cressie-Read/Tsallis non-additive entropy, we come across a covariant quantity called, alternatively, a generalized Ricci curvature, an N-Ricci curvature or a Bakry-Émery-Ricci curvature ...
Nikos Kalogeropoulos
doaj +1 more source
Estimating the trace-free Ricci tensor in Ricci flow [PDF]
Proceedings of the American Mathematical Society, 2009 An important and natural question in the analysis of Ricci flow singularity formation in dimensions four and above is as follows: What are the weakest conditions that provide control of the norm of the Riemann curvature tensor? In this short note, we show that on a compact manifold, the trace-free Ricci tensor is controlled in a precise fashion by the ...
openaire +3 more sources
The Weyl tensor of gradient Ricci solitons [PDF]
Geometry & Topology, 2016 42 ...
Cao, Xiaodong, Tran, Hung
openaire +3 more sources
Some integrability conditions for almost K\"ahler manifolds
, 2003 Among other results, a compact almost K\"ahler manifold is proved to be K\"ahler if the Ricci tensor is semi-negative and its length coincides with that of the star Ricci tensor or if the Ricci tensor is semi-positive and its first order covariant ...
Alexandrov +29 more
core +1 more source
Monotone Volume Formulas for Geometric Flows [PDF]
, 2010 We consider a closed manifold M with a Riemannian metric g(t) evolving in direction -2S(t) where S(t) is a symmetric two-tensor on (M,g(t)). We prove that if S satisfies a certain tensor inequality, then one can construct a forwards and a backwards ...
Feldman M. +4 more
core +3 more sources