Showing papers on "Four-tensor published in 1994"
TL;DR: Using the Kerr-Schild decomposition of the metric tensor that employs the algebraically special nature of the Kerr--Newman spacetime family, the energy-momentum tensor was calculated in this article.
Abstract: Using the Kerr--Schild decomposition of the metric tensor that employs the algebraically special nature of the Kerr--Newman spacetime family, we calculate the energy--momentum tensor. The latter turns out to be a well defined tensor distribution with disc-like support.
82 citations
TL;DR: In this paper, the infinitesimal theory of analytic multidimensional hexagonal three-webs is discussed and the corresponding integrability conditions of these three-web structures are analyzed.
Abstract: In the following we discuss the infinitesimal theory of analytic multidimensional hexagonal three-webs It is known that the structure of any such three-web in a neighborhood of an arbitrary point is uniquely determined by four tensor values at the given point We prove that three of them are sufficient and we analyze the corresponding integrability conditions
9 citations
TL;DR: In this paper, the average effective energy-momentum tensor for a spherically symmelric cosmology with randomly oriented spin was developed in the framework of the self-consistent Einstein-Cartan theory with spindensity.
Abstract: We develop the average effective energy-momentum tensor for a spherically symmelric cosmology with randomly oriented spin using the improved energy-momentum tensor in the framework of the self-consistent Einstein-Cartan theory with spindensity. PACS numbers: 9530S, 9880C. 4775,0340G. 0450
4 citations
TL;DR: In this paper, a covariant flux-limited diffusion theory is presented for homogeneous and anisotropic cosmologies, and explicit formulas for radiation stress tensor and applications are given for Bianchi-type I model.
Abstract: A covariant flux-limited diffusion theory is presented for homogeneous and anisotropic cosmologies. Explicit formulas for radiation stress tensor and applications are given for Bianchi-type I model.
3 citations
TL;DR: In this article, the authors add antisymmetric tensor degrees of freedom to the usual superstring coordinates and show that super and kappa symmetries are only achieved for the spacetime dimensionD=4.
Abstract: We add antisymmetric tensor degrees of freedom to the usual superstring coordinates. We show that super and kappa symmetries are only achieved for the spacetime dimensionD=4. We also address problems related to the quantization of the model and discuss the influences of this extended spacetime in the usual quantum field theory.
2 citations
TL;DR: In this paper, the scalar-tensor theories are formulated against a flat background space-time, and expressions for various energy-momentum tensors of the gravitational field and relations between them are obtained.
Abstract: The scalar-tensor theories are formulated against a flat background space-time. Expressions for various energy-momentum tensors of the gravitational field and relations between them are obtained. Integral conservation laws are examined and formulas for four-momentum and angular momentum tensor of the gravitational field together with the matrix are derived.