Entity

Time filter

Source Type


Dzhunushaliev V.,Al-Farabi Kazakh National University | Folomeev V.,Institute of Physicotechnical Problems and Material Science of the NAS of the Kyrgyz Republic
European Physical Journal C | Year: 2015

We consider the propagation of strong gravitational waves interacting with a nonperturbative vacuum of spinor fields. To described the latter, we suggest an approximate model. The corresponding Einstein equation has the form of the Schrödinger equation. Its gravitational-wave solution is analogous to the solution of the Schrödinger equation for an electron moving in a periodic potential. The general solution for the periodic gravitational waves is found. The analog of the Kronig–Penney model for gravitational waves is considered. It is shown that the suggested gravitational-wave model permits the existence of weak electric charge and current densities concomitant with the gravitational wave. Based on this observation, a possible experimental verification of the model is suggested. © 2015, The Author(s). Source


Dzhunushaliev V.,KazNU | Folomeev V.,Institute of Physicotechnical Problems and Material Science of the NAS of the Kyrgyz Republic | Makhmudov A.,Peoples Friendship University of Russia | Urazalina A.,KazNU | And 4 more authors.
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2016

In this work, we investigate localized and extended objects for gravitating, self-interacting phantom fields. The phantom fields come from two scalar fields with a "wrong-sign" (negative) kinetic energy term in the Lagrangian. This study covers several solutions supported by these phantom fields: phantom balls, traversable wormholes, phantom cosmic strings, and "phantom" domain walls. These four systems are solved numerically, and we try to draw out general, interesting features in each case. © 2016 American Physical Society. Source


Folomeev V.,University of Oldenburg | Folomeev V.,Institute of Physicotechnical Problems and Material Science of the NAS of the Kyrgyz Republic | Singleton D.,California State University, Fresno
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2012

In this paper we investigate gravitationally bound, spherically symmetric equilibrium configurations consisting of ordinary (polytropic) matter nonminimally coupled to an external chameleon scalar field. We show that this system has static, regular, asymptotically flat general relativistic solutions. The properties of these spherical configurations, such as total mass, distribution of matter, and size, depend strongly on the surrounding scalar field. The mass is found in terms of the parameter σ, which is proportional to the central mass density of the ordinary matter. We perform a stability analysis of these spherical solutions and find an upper bound for σ where dynamical instability occurs. © 2012 American Physical Society. Source


Dzhunushaliev V.,University of Oldenburg | Dzhunushaliev V.,Al-Farabi Kazakh National University | Dzhunushaliev V.,Kazakh National University | Dzhunushaliev V.,Institute of Physicotechnical Problems and Material Science of the NAS of the Kyrgyz Republic | And 5 more authors.
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2013

We consider rotating Lorentzian wormholes with a phantom field in five dimensions. These wormhole solutions possess equal angular momenta and thus represent cohomogeneity-1 configurations. For a given size of the throat, the angular momenta are bounded by the value of the corresponding extremal Myers-Perry black hole, which represents the limiting configuration. With increasing angular momenta the throat becomes increasingly deformed. At the same time, the violation of the null energy condition decreases to zero, as the limiting configuration is approached. Symmetric wormhole solutions satisfy a Smarr-like relation, which is analogous to the Smarr relation of extremal black holes. A stability analysis shows that the unstable mode of the static wormhole solutions vanishes when the angular momentum exceeds some critical value. © 2013 American Physical Society. Source


Dzhunushaliev V.,University of Oldenburg | Dzhunushaliev V.,Eurasian University | Dzhunushaliev V.,Institute of Physicotechnical Problems and Material Science of the NAS of the Kyrgyz Republic
International Journal of Geometric Methods in Modern Physics | Year: 2011

Stochastic Einstein equations are considered when three-dimensional space metric γij are stochastic functions. The probability density for the stochastic quantities is connected with Perelman's entropy functional. As an example, the Friedman Universe is considered. It is shown that for the Friedman Universe the dynamical evolution is not changed. The connection between general relativity and Ricci flow is discussed. © 2011 World Scientific Publishing Company. Source

Discover hidden collaborations