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pro vyhledávání: '"Skvortsova, M. A."'
The widely discussed ``black-bounce'' mechanism of removing a singularity at $r=0$ in a spherically symmetric space-time, proposed by Simpson and Visser, consists in removing the point $r=0$ and its close neighborhood, resulting in emergence of a reg
Externí odkaz:
http://arxiv.org/abs/2405.09124
Autor:
Skvortsova, M. A.
In the paper we consider a system of differential equations with two delays describing plankton--fish interaction. We study stability of the equilibrium point corresponding to the presence of phytoplankton and zooplankton in the system and the absenc
Externí odkaz:
http://arxiv.org/abs/2312.11483
Autor:
Skvortsova, M. A.
We consider a model of antiviral immune response proposed in the works of G.I. Marchuk. The model is described by a system of delay differential equations. The asymptotic stability of a stationary solution to the system corresponding to a completely
Externí odkaz:
http://arxiv.org/abs/2212.14707
Publikováno v:
Grav. Cosmol. 28 (4), 402-410 (2022)
We consider the gravity assist maneuver, that is, a correction of spacecraft motion at its passing near a planet, as a tool for evaluating the Eddington post-Newtonian parameters $\beta$ and $\gamma$, characterizing vacuum spherically symmetric gravi
Externí odkaz:
http://arxiv.org/abs/2208.14016
Publikováno v:
Grav. Cosmol. 27 (4), 358-374 (2021)
We discuss vacuum static, spherically symmetric asymptotically flat solutions of the generalized hybrid metric-Palatini theory of gravity (generalized HMPG) suggested by B\"ohmer and Tamanini, involving both a metric $g_{\mu\nu}$ and an independent c
Externí odkaz:
http://arxiv.org/abs/2109.01794
Publikováno v:
Universe 6, 178 (2020)
We discuss the properties of the previously constructed model of a Schwarzschild black hole interior where the singularity is replaced by a regular bounce, ultimately leading to a white hole. The model is semiclassical in nature and uses as a source
Externí odkaz:
http://arxiv.org/abs/2009.06330
Publikováno v:
Universe 6, 172 (2020)
We discuss static, cylindrically symmetric vacuum solutions of hybrid metric-Palatini gravity (HMPG), a recently proposed theory that has been shown to successfully pass the local observational tests and to produce a certain progress in cosmology. We
Externí odkaz:
http://arxiv.org/abs/2009.03952
Publikováno v:
Grav. Cosmol. 26, 212-227 (2020)
The hybrid metric-Palatini theory of gravity (HMPG), proposed in 2012 by T. Harko et al., is known to successfully describe both local (solar-system) and cosmological observations. We discuss static, spherically symmetric vacuum solutions of HMPG wit
Externí odkaz:
http://arxiv.org/abs/2006.00559
Publikováno v:
Int. J. Mod. Phys. A 35, 2040051 (2020)
We have previously shown that the singularity in a Schwarzschild black hole of stellar or larger mass may be avoided in a semiclassical manner by using as a source of gravity the stress-energy tensor (SET) corresponding to vacuum polarization of quan
Externí odkaz:
http://arxiv.org/abs/1909.06888
Publikováno v:
Grav. Cosmol. 25, 122-130 (2019)
We consider anisotropic fluids with directional pressures $p_i = w_i \rho$ ($\rho$ is the density, $w_i = $const, $i = 1,2,3$) as sources of gravity in stationary cylindrically symmetric space-times. We describe a general way of obtaining exact solut
Externí odkaz:
http://arxiv.org/abs/1904.06727