Results 1 - 10 of 3471
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[en] With the Coulomb gauge, the Chern-Simons-Georgi-Glashow (CSGG) model is quantized in the Dirac formalism for the constrained system. Combining the Gauss law and Coulomb gauge consistency condition, the difference between the Schwinger angular momentum and canonical angular momentum of the system is found to be an anomalous spin. The reason for this result lies in the fact that the Schwinger energy momentum tensor and the canonical one have different symmetry properties in the presence of the Chern-Simons term. (authors)
[en] Starting with the algebraic classification of the energy-momentum tensor given by Plebansky, it is established that this classification is unstable under versal deformations and a new (stable) classification is given. In order to keep the text to reasonable length, we just write the basic ideas and some results. (Author) (Author)
[en] The physical structure of the energy-momentum tensor is of great importance in General Relativity. In the last few years many people have discussed various aspects of this subject. The present study discusses some of the algebraic and geometric interpretations of these physical structures. It will be shown how a systematic use of the theory of the classification of energy-momentum tensors greatly simplifies many problems. (author)
[en] It was pointed out some time ago that in a supersymmetric theory the axial current j5μ, the improved energy-momentum tensor θμν and the improved supersymmetry current Sμ can be identified with the components of a superfield. Vμ, so that an intimate relation exists between them. This paper discusses how, at the classical level, this superfield satisfies certain relations reflecting the conservation and trace relations (modulo mass terms)
[en] Padmanabhan’s emergent cosmic space proposal is exploited to study the Rastall theory which involves modifying the covariant conservation law of energy-momentum tensor. As necessary elements for this approach, we firstly find the Komar energy and the general entropy of apparent horizon in this theory. After that, a modified expansion law is invoked to re-obtain the Friedmann equations. (note)
[en] The osp(2n|2n) current algebra for a generic positive integer n at general level k is investigated. Its free-field representation and corresponding energy-momentum tensor are constructed. The associated screening currents of the first kind are also presented.
[en] The energy-momentum tensor of areal objects in the Riemannian world is considered. These objects are called aether fibres and appear as elements—constituents of a specific matter called the aether one.
[en] We summarized both the general covariant energy-momentum and angular momentum conservation law in the gravitational system and analyzed the general covariant energy-momentum tensor of the gravitational system in general five-dimensional cosmological in brane-universe models. After calculating this energy-momentum for the cosmological generalization of the Randall-Sundrum (RS) model which includes the original RS model as the static limit, we are able to show that the weakness of the gravitation on the 'visible' brane is a general feature of this model. This is the origin of the gauge hierarchy from a gravitational point of view. Our results are also consistent with the fact that a gravitational system has vanishing total energy. We also discussed the properties of the general covariant angular momentum in five-dimensional brane-universe model. With calculation of the total angular momentum of this model, we analyzed the properties of the total angular momentum in the inflationary RS model. We pointed that the space-like components of the total angular momentum are zero while the others are non-zero, which agrees with the results from ordinary RS model. We also investigated the bulk cosmological constant and brane vacuum energies in RS model. We show that the five-dimensional bulk cosmological constant and the vacuum energies of the two branes could take their natural values. Finally we argued how we can generate a small four-dimensional effective cosmological constant on the branes by modifying the original RS model. (authors)