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Search Results: 1 - 10 of 586336 matches for " A. N. Makarenko "
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Wormholes in the Braneworld
A. N. Makarenko
Physics , 2004,
Abstract: We discuss brane wormhole solution when classical brane action contains 4d curvature. The equations of motion for the cases with R=0 and $R\ne 0$ are obtained. Their numerical solutions corresponding to wormhole are found for specific boundary conditions.
Conjugate flows and amplitude bounds for internal solitary waves
N. I. Makarenko, J. L. Maltseva,A. Yu. Kazakov
Nonlinear Processes in Geophysics (NPG) , 2009,
Abstract: Amplitude bounds imposed by the conservation of mass, momentum and energy for strongly nonlinear waves in stratified fluid are considered. We discuss the theoretical scheme which allows to determine broadening limits for solitary waves in the terms of a given upstream density profile. Attention is focused on the continuously stratified flows having multiple broadening limits. The role of the mean density profile and the influence of fine-scale stratification are analyzed.
Indonesian linguistics in the Soviet Union in the ‘60’s and ‘70’s
L.N. Demidyuk,V.A. Makarenko
Bijdragen tot de Taal-, Land- en Volkenkunde , 1980,
Kantowski-Sachs Brane Cosmology
A. N. Makarenko,V. V. Obukhov,K. E. Osetrin
Physics , 2003,
Abstract: We consider brane Kantowski-Sachs Universe when bulk space is five-dimensional Anti-deSitter space. The corresponding cosmological equations with perfect fluid are written. For several specific choices of relation between energy and pressure it is found the behavior of scale factors at early time. In particulary, for $\gamma=3/2$ Kantowski-Sachs brane cosmology is modified to become the isotropic one, while for $\gamma=1$ it remains the anisotropic cosmology in the process of evolution.
From Big to Little Rip in modified F(R,G) gravity
A. N. Makarenko,V. V. Obukhov,I. V. Kirnos
Physics , 2012, DOI: 10.1007/s10509-012-1240-1
Abstract: We discuss the cosmological reconstruction in modified Gauss-Bonnet (GB) gravity. It is demonstrated that the modified GB gravity may describe the most interesting features of late-time cosmology. We derive explicit form of effective phantom cosmological models ending by the finite-time future singularity (Big Rip) and without singularities in the future (Little Rip).
The nature of singularity in multidimensional anisotropic Gauss-Bonnet cosmology with a perfect fluid
I. V. Kirnos,A. N. Makarenko,S. A. Pavluchenko,A. V. Toporensky
Physics , 2009, DOI: 10.1007/s10714-010-1004-6
Abstract: We investigate dynamics of (4+1) and (5+1) dimensional flat anisotropic Universe filled by a perfect fluid in the Gauss-Bonnet gravity. An analytical solutions valid for particular values of the equation of state parameter $w=1/3$ have been found. For other values of $w$ structure of cosmological singularity have been studied numerically. We found that for $w > 1/3$ the singularity is isotropic. Several important differences between (4+1) and (5+1) dimensional cases are discussed.
Stationary vs. singular points in an accelerating FRW cosmology derived from six-dimensional Einstein-Gauss-Bonnet gravity
E. Elizalde,A. N. Makarenko,V. V. Obukhov,K. E. Osetrin,A. E. Filippov
Physics , 2006, DOI: 10.1016/j.physletb.2006.11.031
Abstract: Six-dimensional Einstein-Gauss-Bonnet gravity (with a linear Gauss-Bonnet term) is investigated. This theory is inspired by basic features of results coming from string and M-theory. Dynamical compactification is carried out and it is seen that a four-dimensional accelerating FRW universe is recovered, when the two-dimensional internal space radius shrinks. A non-perturbative structure of the corresponding theory is identified which has either three or one stable fixed points, depending on the Gauss-Bonnet coupling being positive or negative. A much richer structure than in the case of the perturbative regime of the dynamical compactification recently studied by Andrew, Bolen, and Middleton is exhibited.
Multiple $Λ$CDM cosmology with string landscape features and future singularities
E. Elizalde,A. N. Makarenko,S. Nojiri,V. V. Obukhov,S. D. Odintsov
Physics , 2012, DOI: 10.1007/s10509-012-1339-4
Abstract: Multiple $\Lambda$CDM cosmology is studied in a way that is formally a classical analog of the Casimir effect. Such cosmology corresponds to a time-dependent dark fluid model or, alternatively, to its scalar field presentation, and it motivated by the string landscape picture. The future evolution of the several dark energy models constructed within the scheme is carefully investigated. It turns out to be almost always possible to choose the parameters in the models so that they match the most recent and accurate astronomical values. To this end, several universes are presented which mimick (multiple) $\Lambda$CDM cosmology but exhibit Little Rip, asymptotically de Sitter, or Type I, II, III, and IV finite-time singularity behavior in the far future, with disintegration of all bound objects in the cases of Big Rip, Little Rip and Pseudo-Rip cosmologies.
Lie type algebras with an automorphism of finite order
N. Yu. Makarenko
Mathematics , 2014,
Abstract: An algebra $L$ over a field $\Bbb F$, in which product is denoted by $[\,,\,]$, is said to be \textit{ Lie type algebra} if for all elements $a,b,c\in L$ there exist $\alpha, \beta\in \Bbb F$ such that $\alpha\neq 0$ and $[[a,b],c]=\alpha [a,[b,c]]+\beta[[a,c],b]$. Examples of Lie type algebras are associative algebras, Lie algebras, Leibniz algebras, etc. It is proved that if a Lie type algebra $L$ admits an automorphism of finite order $n$ with finite-dimensional fixed-point subalgebra of dimension $m$, then $L$ has a soluble ideal of finite codimension bounded in terms of $n$ and $m$ and of derived length bounded in terms of $n$.
Recursive Tangential-Angular Operator as Analyzer of Synchronized Chaos
A. V. Makarenko
Physics , 2011, DOI: 10.1134/S1063785011080244
Abstract: A method for the quantitative analysis of the degree and parameters of synchronization of the chaotic oscillations in two coupled oscillators is proposed, which makes it possible to reveal a change in the structure of attractors. The proposed method is tested on a model system of two unidirectionally coupled logistic maps. It is shown that the method is robust with respect to both the presence of a low-intensity noise and a nonlinear distortion of the analyzed signal. Specific features of a rearranged structure of the attractor of a driven subsystem in the example under consideration have been studied.
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