نتایج جستجو برای: the non riemannian quantity h
تعداد نتایج: 16315966 فیلتر نتایج به سال:
Meaghan Wall 1 , 3 , 4 , Gretchen Poortinga 1 , 3 , Kym L. Stanley 1 , Ralph K. Lindemann 1 , 13 , Michael Bots 1 , Christopher J. Chan 1 , 9 , Megan J. Bywater 1 , Kathryn M. Kinross 1 , Megan V. Astle 1 , Kelly Waldeck 1 , Katherine M. Hannan 1 , Jake Shortt 1 , 3 , Mark J. Smyth 1 , 6 , 7 , Scott W. Lowe 11 , 12 , Ross D. Hannan 1 , 5 , 7 , 8 , 10 , Richard B. Pearson 1 , 5 , 7 , 8 , Ricky W...
We consider the usual Einstein-Hilbert action in a Metric-Affine setup and presence of Perfect Hyperfluid. In order to decode role shear hypermomentum, we impose vanishing spin dilation parts on sources allow only for non-vanishing shear. then an FLRW background derive generalized Friedmann equations hypermomentum. By providing one equation state among variables study cases which has accelerati...
In this work we provide the motivation for considering non-Riemannian models in cosmology. Non-Riemannian extensions of general relativity theory have been studied for a long time. In such theories the spacetime continuum is no longer described by the metric alone but endowed with additional geometric quantities. These new quantities can be coupled to the intrinsic properties of matter in a ver...
We provide a brief chronological guide to the literature on non-Riemannian cosmological models. Developments in this field are traced back to the early seventies and are given in table form.
I. Introduction-a quick historical survey of geodesic flows on negatively curved spaces. II. Preliminaries on Riemannian manifolds A. Riemannian metric and Riemannian volume element B. Levi Civita connection and covariant differentiation along curves C. Parallel translation of vectors along curves D. Curvature E. Geodesics and geodesic flow F. Riemannian exponential map and Jacobi vector fields...
A method, due tó Elie Cartan, is used to give an algebraic classification of the non-reductive homogeneous pseudo-Riemannian manifolds of dimension four. Only one case with Lorentz signature can be Einstein without having constant curvature, and two cases with (2,2) signature are Einstein of which one is Ricci-flat. If a four-dimensional non-reductive homogeneous pseudo-Riemannian manifold is s...
Two classes of metrics obtained from non-Riemannian gravitational collapse are presented.The first is the Taub planar symmetric exact solutions of Einstein-Cartan field equations of gravity describing torsion walls which are obtained from gravitational collapse of time dependent perturbation of Riemannian Taub symmetric solutions of General Relativity.The second is a modification of the Vilenki...
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