A. M. Sid-Ahmed

TL;DR: In this article, the authors discuss linear connections and curvature tensors in the context of geometry of parallelizable manifolds (or absolute parallelism geometry) using Bianchi identities.

TL;DR: In this paper, a field theory unifying gravity and electromagnetism in the context of extended absolute parallelism (EAP) geometry was constructed, which is a generalization of the generalized field theory (GFT) formulated by Mikhail and Wanas.

Abstract: In this paper, we study Absolute Parallelism (AP-) geometry on the tangent bundle TM of a manifold M. Accordingly, all geometric objects defined in this geometry are not only functions of the positional argument x, but also depend on the directional argument y. Moreover, many new geometric objects, which have no counterpart in the classical AP-geometry, emerge in this different framework. We refer to such a geometry as an Extended Absolute Parallelism (EAP-) geometry. The building blocks of the EAP-geometry are a nonlinear connection (assumed given a priori) and 2n linearly independent vector fields (of special form) defined globally on TM defining the parallelization. Four different d-connections are used to explore the properties of this geometry. Simple and compact formulae for the curvature tensors and the W-tensors of the four defined d-connections are obtained, expressed in terms of the torsion and the contortion tensors of the EAP-space. Further conditions are imposed on the canonical d-connection assuming that it is of Cartan type (resp. Berwald type). Important consequences of these assumptions are investigated. Finally, a special form of the canonical d-connection is studied under which the classical AP-geometry is recovered naturally from the EAP-geometry. Physical aspects of some of the geometric objects investigated are pointed out and possible physical implications of the EAP-space are discussed, including an outline of a generalized field theory on the tangent bundle TM of M.

TL;DR: In this paper, a generalization of the AP-geometry in the context of generalized Lagrange spaces is presented, where geometric objects de-flned in this geometry are not only functions of the positional argument x, but also depend on the directional argument y.

TL;DR: In this article, an Extended Absolute Parallelism (EAP)-geometry is studied on the tangent bundle of a manifold, where all geometric objects defined in this geometry are not only functions of the positional argument, but also depend on the directional argument.