Zobrazeno 1 - 10
of 22
pro vyhledávání: '"Koutvitsky, Vladimir A."'
Publikováno v:
Phys. Rev. D 109, 044024 (2024)
Nonlinear differential equations are derived that describe the time evolution of the test particle coordinates during finite motions in the gravitational field of oscillating dark matter. It is shown that in the weak field approximation, the radial o
Externí odkaz:
http://arxiv.org/abs/2406.03351
Publikováno v:
Phys. Rev. D 104, 124046 (2021)
Applying the perturbative approach to geodesic equations, we study motion of the test particles in time-dependent spherically symmetric spacetimes created by oscillating dark matter. Assuming the weakness of the gravitational field, we derive general
Externí odkaz:
http://arxiv.org/abs/2201.13199
Publikováno v:
Theoretical and Mathematical Physics 201(3), 1793-1797 (2019)
The gravitational frequency shift of light signals from the center of a spherically symmetric non-static matter distribution is considered. Explicit formulas for the ratio of the emitted and received frequencies are obtained in the case of the oscill
Externí odkaz:
http://arxiv.org/abs/2012.08928
Publikováno v:
Phys. Rev. D 102, 064007 (2020)
Using the geodesic method and the perturbative approach, we study the deflection of light by time-periodic spherically symmetric gravitational fields. Assuming the weakness of the gravitational field, we derive general formulas that determine the def
Externí odkaz:
http://arxiv.org/abs/2012.08200
Publikováno v:
Extended version of the paper published in J. Mathematical Physics V. 59, 113504 (2018)
We investigate the dynamics of the perturbations of the inflaton scalar field oscillating around a minimum of its effective potential in an expanding universe. With the assumption of smallness of the ratio of the Hubble parameter to the oscillation f
Externí odkaz:
http://arxiv.org/abs/1901.09914
Dynamics of the inflaton scalar field oscillating around a minimum of the singular potentials in the expanding Universe is investigated. Asymptotic formulas are obtained describing the cosmological expansion at the late times. The problem of stabilit
Externí odkaz:
http://arxiv.org/abs/1611.03734
Publikováno v:
Phys.Rev.D83:124028,2011
We search for self-gravitating oscillating field lumps (pulsons) in the scalar model with logarithmic potential. With the use of a Krylov-Bogoliubov-type asymptotic expansion in the gravitational constant, the pulson solutions of the Einstein-Klein-G
Externí odkaz:
http://arxiv.org/abs/1106.5377
Publikováno v:
J.Math.Phys.47:022302,2006
We investigate stability of both localized time-periodic coherent states (pulsons) and uniformly distributed coherent states (oscillating condensate) of a real scalar field satisfying the Klein-Gordon equation with a logarithmic nonlinearity. The lin
Externí odkaz:
http://arxiv.org/abs/hep-th/0510097
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