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pro vyhledávání: '"Smirnov, A. L."'
Autor:
Smirnov, Alexey L.
In this study, we consider the time-symmetric initial data problem for GR minimally coupled with a phantom scalar field and a Maxwell field. The main focus is on initial data sets describing two interacting mouths of the same traversable wormhole. Th
Externí odkaz:
http://arxiv.org/abs/2312.09622
Publikováno v:
Известия Саратовского университета. Новая серия. Серия Математика. Механика. Информатика, Vol 24, Iss 1, Pp 49-56 (2024)
The paper examines the natural frequencies of prismatic thin shells, the cross-section of which is the regular polygon. Spectra of free vibration frequencies of such shells are analyzed as the number of cross-section sides increases, provided that th
Externí odkaz:
https://doaj.org/article/06272be22f054efc8f8277ebd918ef6c
Publikováno v:
JCAP11(2021)053
We investigated the possibility of construction the homogeneous and isotropic cosmological solutions in Weyl geometry. We derived the self-consistency condition which ensures the conformal invariance of the complete set of equations of motion. There
Externí odkaz:
http://arxiv.org/abs/2107.06160
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
In the present paper we investigate the conservative conditions in Quadratic Gravity. It is shown explicitly that the Bianchi identities lead to the conservative condition of the left-hand-side of the (gravitational) field equation. Therefore, the to
Externí odkaz:
http://arxiv.org/abs/2009.06176
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
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Publikováno v:
Археология евразийских степей, Iss 5, Pp 207-216 (2022)
The materials obtained from a newly found archaeological site – Igimskiy Bor I settlement are published in the paper. The settlement is located on the edge of the butte of a high terrace on the right bank of the Ik river oxbow, in a protected area
Externí odkaz:
https://doaj.org/article/6bc1b11688f548418d430cf7a15880d6
Autor:
Smirnov, Veniamin L., Tolosa, Juan J.
The original proof of the Sharkovsky theorem is presented in full detail. The proof should be accessible to readers with basic Real Analysis background. Although nowadays there are several alternative proofs of this classical result, we believe the o
Externí odkaz:
http://arxiv.org/abs/1702.07964