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1.
We show that the shell-universe model (used to explain the observed expansion rate of the universe without a dark energy component) provides a natural mechanism for local increasing of the brane tension leading to the modified Newtons law alternative to galactic dark matter. 相似文献
2.
Merab Gogberashvili Lasha Pantskhava 《International Journal of Theoretical Physics》2018,57(6):1763-1773
By reexamination of the boundary conditions of wave equation on a black hole horizon it is found not harmonic, but real-valued exponentially time-dependent solutions. This means that quantum particles probably do not cross the Schwarzschild horizon, but are absorbed and some are reflected by it, what potentially can solve the famous black hole information paradox. To study this strong gravitational lensing we are introducing an effective negative cosmological constant between the Schwarzschild and photon spheres. It is shown that the reflected particles can obtain their additional energy in this effective AdS space and could explain properties of some unusually strong signals, like LIGO events, gamma ray and fast radio bursts. 相似文献
3.
Merab Gogberashvili Pavle Midodashvili Giorgi Tukhashvili 《General Relativity and Gravitation》2014,46(4):1-12
The new class of the non-stationary solutions to the system of N-dimensional equations for coupled gravitational and massless scalar field is found. The model represents a single (N-1)-brane in a space-time with one large (infinite) and (N-5) small (compact) space-like extra dimensions. In some particular cases the model corresponds to the gravitational and scalar field standing waves bounded by the brane. These braneworlds can be relevant in string and other higher dimensional models. 相似文献
4.
We investigate the problem of localization of gauge fields within the 5D standing wave braneworld model and show that in the case of increasing warp factor there exist normalizable vector field zero modes on the brane. 相似文献
5.
Merab Gogberashvili 《Foundations of Physics Letters》2002,15(5):487-493
The optical Sagnac effect is considered, when the fictitious gravitational field simulates the reflections from the mirrors.
It is shown that no contradiction exists between the conclusions of the laboratory and rotated observers. Because of the acting
of a gravity-like Coriolis force, the trajectories of coand anti-rotating photons have different radii in the rotating reference
frame, while in the case of equal radii the effective gravitational potentials for the photons have to be different. 相似文献
6.
M. Y. Gogberashvili 《Theoretical and Mathematical Physics》1997,113(3):1572-1581
The main problem with the standard gauge theory of the Poincaré group realized as a subgroup of GL(5, R) is that fields, whose physical sense is unclear, appear in connection with the non-Lorentz symmetries. Here, the Poincaré
fields are treated as new Yang-Mills-type tensor fields and gravity is treated as a Higgs-Goldstone field. In this case, the
effective metric tensor for matter is a hybrid of two tensor fields. In the linear approximation, the massive translation
gauge field gives the Yukawa-type correction to the Newtonian potential. Also, corrections to the standard Einstein post-Newtonian
formulas for light deflection and radar echo delay are obtained.
A spherically symmetric solution to the equations of translation gauge fields is also found. The translation gauge field leads
to the existence of a singular surface, which is impenetrable to matter and can prevent gravitational collapse of a large
body, inside the Schwarzschild sphere.
Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 113, No. 3, pp. 448–460, December, 1997.
This work was supported in part by the Georgian Government and the International Science Foundation (ISF Grant No. MXL 200). 相似文献
7.
It is shown that the equations of motion and Tolman's formula require reverse flow of time on a spherical domain wall. Moreover, the active gravitational mass of the wall becomes negative. The critical mass and radius of a bubble are found for realistic models.Institute of Physics, Georgian Academy of Sciences. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 100, No. 2, pp. 303–311, August, 1994. 相似文献
8.
We consider the disagreements in gravitational properties of planar and spherical domain walls (bubbles). We argue that if the spherical domain walls are described by the same equation of state as the planar walls are, then they also exhibit gravitational repulsion just as the planar walls are assumed to do. In the thin-wall approximation we show the existence of the solution of Einstein equations with negative gravitational mass of bubbles and the reversed direction of time flow on the shell. The equilibrium radius and critical mass of such objects are found for realistic models. 相似文献
9.
Merab Gogberashvili 《International Journal of Theoretical Physics》2016,55(9):4185-4195
We describe the universe as a single entangled ensemble of quantum particles. The total entropy of this world ensemble, which can be expressed as a sum of information, thermodynamic and entanglement components, is assumed to be always zero. This condition suggests information quantization, which we associate with the Planck’s action. Then the entropy neutrality condition for the universe leads to the zero-action principle. We show that the main concepts of classical space-time and gravity naturally emerge in this picture. A generalized least action principle, which embraces the maximal entropy principles of information theory, is introduced. 相似文献
10.
Merab Gogberashvili Igor Kanatchikov 《International Journal of Theoretical Physics》2012,51(3):985-997
We discuss the emergence of relativistic effects in the Machian universe with a global preferred frame and use thermodynamic
considerations to clarify the origin of gravity as an entropic force and the origin of dark energy/cosmic acceleration as
related to the Hawking-Unruh temperature at the universe’s horizon. 相似文献