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Cosmological acceleration from a scalar field and classical and quantum gravitational waves (Inflation and dark energy)
Pleiades Publishing Ltd - Tập 23 - Trang 201-207 - 2017
Leonid Marochnik
We show that, on the average, a homogeneous and isotropic scalar field and, on the average, homogeneous and isotropic ensembles of classical and quantum gravitational waves generate the de Sitter expansion of empty (with no matter) space-time. At the start and by the end of its cosmological evolution, the Universe is empty. The contemporary Universe is about 70% empty, so the effect of cosmologica...... hiện toàn bộ
The Newtonian gravitational constant: Modern status of measurement and the new CODATA value
Pleiades Publishing Ltd - Tập 18 - Trang 216-224 - 2012
V. Milyukov, Shu-hua Fan
Measurements of G, the Newtonian constant of gravitation, in laboratory experiments have a more than two hundred years’ history. Although the accuracy of the best modern experimental measurements of G reaches 15–40 ppm, the scatter of the measured values is large enough, and the knowledge of the absolute value of G is still rather poor. The results of the G measurements which were used for CODATA ...... hiện toàn bộ
Spin-spin interaction in general relativity and induced geometries with nontrivial topology
Pleiades Publishing Ltd - Tập 15 - Trang 337-340 - 2009
V. G. Krechet, D. V. Sadovnikov
We consider the dynamics of a self-gravitating spinor field and a self-gravitating rotating perfect fluid. It is shown that both these matter distributions can induce a vortex field described by the curl 4-vector of a tetrad: θ i = ½ε iklm e (a)k ...... hiện toàn bộ
Interaction of chiral fields of the dark sector with cold dark matter
Pleiades Publishing Ltd - Tập 18 - Trang 262-269 - 2012
R. R. Abbyazov, S. V. Chervon
We study models containing matter in the form of dust and the fields of a two-component nonlinear sigma model describing dark energy. We consider the background and perturbation equations for the suggested models and compare them with the ΛCDM model.
Virial estimator for dark energy
Pleiades Publishing Ltd - Tập 18 - Trang 1-5 - 2012
A. D. Chernin, P. Teerikorpi, M. J. Valtonen, V. P. Dolgachev, L. M. Domozhilova, G. G. Byrd
A new estimator of the local density of dark energy is suggested, which comes from the virial theorem for non-relativistic gravitating systems embedded in the uniform dark energy background.
A Cosmological Scenario with Rotation
Pleiades Publishing Ltd - Tập 25 - Trang 362-365 - 2019
O. V. Sandakova, D. M. Yanishevsky, V. F. Panov
A Bianchi type IX cosmological model with expansion and rotation has been constructed in the framework of general relativity. The model comprises the Friedmannian stages of the Universe evolution including the subsequent transition to accelerated exponential expansion observed nowadays. The gravitational field sources of the model are ultrarelativistic matter, dust and a comoving anisotropic rotat...... hiện toàn bộ
Conformally and gauge invariant spin-2 field equations
Pleiades Publishing Ltd - Tập 19 - Trang 163-170 - 2013
C. S. O. Mayor, G. Otálora, J. G. Pereira
Using an approach based on the Casimir operators of the de Sitter group, conformally invariant equations for a fundamental spin-2 field are obtained, and their consistency is discussed. It is shown that only when the spin-2 field is interpreted as a 1-form assuming values in the Lie algebra of the translation group, rather than a symmetric second-rank tensor, the field equation is both conformally...... hiện toàn bộ
The Hamiltonian formulation of tetrad gravity: Three-dimensional case
Pleiades Publishing Ltd - Tập 16 Số 3 - Trang 181-194 - 2010
Alexei M. Frolov, N. Kiriushcheva, S. V. Kuzmin
Dilaton-scalar models in the context of generalized affine gravity theories: Their properties and integrability
Pleiades Publishing Ltd - Tập 19 - Trang 209-218 - 2013
E. Davydov, A. T. Filippov
Nowadays it is widely accepted that the evolution of the Universe was driven by some scalar degrees of freedom both on its early stage and at present. The corresponding cosmological models often involve some scalar fields introduced ad hoc. In this paper we cultivate a different approach, based on a derivation of new scalar degrees of freedom from fundamental modifications of Einstein’s gravity. I...... hiện toàn bộ
Static Weyssenhoff Fluid Sphere Models in Einstein–Cartan Theory of Gravitation
Pleiades Publishing Ltd - Tập 29 - Trang 10-18 - 2023
L. N. Katkar, D. R. Phadatare
Three physically reasonable static Weyssenhoff fluid sphere models have been obtained by solving the relevant field equations of the Einstein–Cartan theory of gravitation, when Weyssenhoff fluid is the source of spin and gravitation. The spin of the gravitating matter influences the fields of these fluid sphere models. The gravitational field of two of the models is proved to be of Petrov type ...... hiện toàn bộ
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