1,084 research outputs found
General covariance violation and the gravitational dark matter. II. Vector graviton
The (four componenet) vector graviton contained in metric, the scalar
component incorporated, is attributed to the violation of the general
covariance to the residual isoharmonic one. In addition to the previously
studied (singlet) scalar graviton, the vector graviton may constitute one more
fraction of the gravitational dark matter. The gravity interactions of the
vector graviton, as well as its impact on the continuous medium are studied.Comment: 10 page
Minimal metagravity vs. dark matter and/or dark energy
The minimal metagravity theory, explicitly violating the general covariance
but preserving the unimodular one, is applied to study the evolution of the
isotropic homogeneous Universe. The massive scalar graviton, contained in the
theory in addition to the massless tensor one, is treated as a source of the
dark matter and/or dark energy. The modified Friedmann equation for the scale
factor of the Universe is derived. The question wether the minimal metagravity
can emulate the LCDM concordance model, valid in General Relativity, is
discussed.Comment: 6 pages, a typo correcte
Quartet-metric general relativity: scalar graviton, dark matter and dark energy
General Relativity extended through a dynamical scalar quartet is proposed as
a theory of the scalar-vector-tensor gravity, generically describing the
unified gravitational dark matter (DM) and dark energy (DE). The implementation
in the weak-field limit of the Higgs mechanism for the gravity, with a
redefinition of metric field, is exposed in a generally covariant form. Under a
natural restriction on parameters, the redefined theory possesses in the
linearized approximation by a residual transverse-diffeomorphism invariance,
and consistently comprises the massless tensor graviton and a massive scalar
one as a DM particle. A number of the adjustable parameters in the full
nonlinear theory and a partial decoupling of the latter from its weak-field
limit noticeably extend the perspectives for the unified description of the
gravity DM and DE in the various phenomena at the different scales.Comment: 17 page
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