Pleiades Publishing Ltd
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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
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...
The Newtonian gravitational constant: Modern status of measurement and the new CODATA value
Pleiades Publishing Ltd - Tập 18 - Trang 216-224 - 2012
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 ...
Spin-spin interaction in general relativity and induced geometries with nontrivial topology
Pleiades Publishing Ltd - Tập 15 - Trang 337-340 - 2009
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 e () , where e () are components of the tetrad. The
energy-momentum tensor T ik (ω) of this field has been found and shown to
violate the strong and weak...
Interaction of chiral fields of the dark sector with cold dark matter
Pleiades Publishing Ltd - Tập 18 - Trang 262-269 - 2012
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 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
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...
Conformally and gauge invariant spin-2 field equations
Pleiades Publishing Ltd - Tập 19 - Trang 163-170 - 2013
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...
The Hamiltonian formulation of tetrad gravity: Three-dimensional case
Pleiades Publishing Ltd - Tập 16 Số 3 - Trang 181-194 - 2010
Static Weyssenhoff Fluid Sphere Models in Einstein–Cartan Theory of Gravitation
Pleiades Publishing Ltd - Tập 29 - Trang 10-18 - 2023
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 $$D...
Dilaton-scalar models in the context of generalized affine gravity theories: Their properties and integrability
Pleiades Publishing Ltd - Tập 19 - Trang 209-218 - 2013
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...
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