Zobrazeno 1 - 10
of 373
pro vyhledávání: '"Dokuchaev, V."'
Autor:
Berezin, V. A., Dokuchaev, V. I.
Publikováno v:
2023 Class. Quantum Grav. 40 015006
We investigated the possibility of the homogeneous and isotropic cosmological solution in Weyl geometry, which differs from the Riemannian geometry by adding the so called Weyl vector. The Weyl gravity is obtained by constructing the gravitational La
Externí odkaz:
http://arxiv.org/abs/2207.00057
Autor:
Berezin, V. A., Dokuchaev, V. I.
Publikováno v:
IJMPA Vol. 37, No. 20n21, 2243005 (2022)
The homogeneous and isotropic cosmological model in the Weyl conformal geometry is considered. We showed that, despite the conformal invariance, the dust matter is allowed in such a universe. It is shown that the number of dust particles is not conse
Externí odkaz:
http://arxiv.org/abs/2203.04257
Publikováno v:
Phys. Part. Nuclei 51, 730 (2020)
The Israel equations for thin shells in General Relativity are derived directly from the least action principle. The method is elaborated for obtaining the equations for double layers in quadratic gravity from the least action principle.
Comment
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Externí odkaz:
http://arxiv.org/abs/2009.12400
Publikováno v:
2021 Class. Quantum Grav. 38 045014
We derived the equations for the double layers in Quadratic Gravity, using solely the least action principle. The advantage of our approach is that, in the process of calculation, the $\delta'$-function does not appear at all, and the $\delta$-functi
Externí odkaz:
http://arxiv.org/abs/2008.01813
Publikováno v:
Universe 6, 158 (2020)
The formation of primordial black holes in the early universe in the Brans-Dicke scalar-tensor theory of gravity is investigated. Corrections to the threshold value of density perturbations are found. Above the threshold, the gravitational collapse o
Externí odkaz:
http://arxiv.org/abs/2007.15347
Autor:
Dokuchaev, V. I., Nazarova, N. O.
Publikováno v:
Universe 2020, 6(9), 154
We review the physical origins for possible visible images of the supermassive black hole M87* in the galaxy M87 and SgrA* in the Milky Way Galaxy. The classical dark black hole shadow of the maximal size is visible in the case of luminous background
Externí odkaz:
http://arxiv.org/abs/2007.14121
Publikováno v:
J. Exp. Theor. Phys. 128, 599 (2019)
A change in gravity law in some regimes is predicted in the modified gravity models that are actively discussed at present. In this paper, we consider a possibility that the signal recorded by the Geograv resonant gravitational-wave detector in 1987
Externí odkaz:
http://arxiv.org/abs/1906.06088
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Autor:
Dokuchaev, V. I., Nazarova, N. O.
Publikováno v:
J. Exp. Theor. Phys. (2019) 128: 578
We argue that a genuine image of the black hole viewed by a distant observer is not its shadow, but a more compact event horizon image probed by the luminous matter plunging into black hole. The external border of the black hole shadow is washed out
Externí odkaz:
http://arxiv.org/abs/1804.08030
Autor:
Dokuchaev, V. I., Nazarova, N. O.
Publikováno v:
Jetp Lett. (2017) 106: 637
The gravitational lensing of a finite star moving around a rotating Kerr black hole has been numerically calculated. Calculations for the direct image of the star and for the first and second light echoes have been performed for the star moving with
Externí odkaz:
http://arxiv.org/abs/1802.00817