共查询到20条相似文献,搜索用时 15 毫秒
1.
Regina Lukmanova Aliya Kulbakova Ramil Izmailov Alexander A. Potapov 《International Journal of Theoretical Physics》2016,55(11):4723-4730
Gravitational lensing is the effect of light bending in a gravitational field. It can be used as a possible observational method to detect or exclude the existence of wormholes. In this work, we extend the work by Abe on gravitational microlensing by Ellis wormhole by including the second order deflection term. Using the lens equation and definition of Einstein radius, we find the angular locations of the physical image inside and outside Einstein ring. The work contains a comparative analysis of light curves between the Schwarzschild black hole and the Ellis wormhole that can be used to distinguish such objects though such distinctions are too minute to be observable even in the near future. We also tabulate the optical depth and event rate for lensing by bulge and Large Magellanic Cloud (LMC) stars. 相似文献
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No Heading Geodecis are studied in one of the Weyl metrics, referred to as the M-Q solution. First, arguments are provided, supporting our belief that this space-time is the more suitable (among the known solutions of the Weyl family) for discussing the properties of strong quasi-spherical gravitational fields. Then, the behaviour of geodesics is compared with the spherically symmetric situation, bringing out the sensitivity of the trajectories to deviations from spherical symmetry. Particular attention deserves the change of sign in proper radial acceleration of test particles moving radially along symmetry axis, close to the r = 2M surface, and related to the quadrupole moment of the source. 相似文献
4.
Spherically Symmetric Wormhole Gravitational Lens Deflection Angle Signifying Braneworld Cosmology 下载免费PDF全文
《中国物理快报》2017,(6)
Previously, the gravitational lens of a wormhole was introduced by various researchers. Their treatment was focused basically on the lens signature that describes wormhole geometrical character such as the differences from a black hole or between any various types of wormhole models. The braneworld scenario provides the idea of spacetime with underlying extra-dimensions. The inclusion of extra-dimensional terms in the lens object spacetime line element will result in some variation in the expression for its gravitational lens deflection angle.Thus in this paper we investigate such variation by deriving this deflection angle expression. As such, this paper not only shows the existence of such variation but also suggests the potential utilization of gravitational lensing to prove the existence of extra dimensions by studying the deflection angle characteristic in accordance with the spacetime expansion rate of the universe. 相似文献
5.
Amos Harpaz 《Foundations of Physics》2007,37(4-5):763-772
The potential of a static electric charge located in a Schwarzschild gravitational field is given by Linet. The expressions
for the field lines derived from this potential are calculated by numerical integration and drawn for different locations
of the static charge in the gravitational field. The field lines calculated for a charge located very close to the central
mass can be compared to those calculated by Hanni–Ruffini. Maxwell equations are used to analyze the dynamics of the falling
electric field in a gravitational field. 相似文献
6.
Igor K. Kulikov 《International Journal of Theoretical Physics》2002,41(8):1481-1490
Trapped noninteracting Fermi gas in an external gravitational field in Newtonian approximation is considered. Analytical equations for chemical potential, internal energy, and specific heat of trapped Fermi gas are computed. The spatial distribution of completely degenerate fermions in nonhomogeneous gravitational field is calculated. The effects of the influence of gravitational field on Fermi gas are discussed. 相似文献
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Russian Physics Journal - 相似文献
8.
Dan Vager 《International Journal of Theoretical Physics》2002,41(6):1191-1200
Carmeli has proposed spinorial field equations in curved space-time to describe gravitation. In this paper we give the relationship between these equations and the standard Einstein gravitational field equations. In particular we show that all solutions to Einstein's equations are solutions to Carmeli's equations, but not vice versa. 相似文献
9.
Valeri P. Frolov 《International Journal of Theoretical Physics》2007,46(9):2181-2191
A gyraton is an object moving with the speed of light and having finite energy and internal angular momentum (spin). First,
we derive the gravitational field of a gyraton in the linear approximation. After this we study solutions of the Einstein
equations for gyratons. We demonstrate that these solutions in 4 and higher dimensions reduce to two linear problems in a
Euclidean space. We obtain the exact solutions for relativistic gyratons, discuss their properties, and consider special examples. 相似文献
10.
Malene Steen Nielsen Flagga 《International Journal of Theoretical Physics》1999,38(8):2121-2161
Is time travel possible? While this paper doesnot answer the question, it does put forward a modelthat may one day answer it. The decoherent-historiesapproach to quantum mechanics is used in a nontrivial background provided by a wormhole whose mouthsreside in the same universe, but have a time differencebetween them. A charged scalar particle approaches thewormhole mouth in the present and is decohered spatially through the interaction with theCoulomb field of the wormhole mouth. 相似文献
11.
Oliver Fabert 《Communications in Mathematical Physics》2011,302(1):113-159
It was pointed out by Y. Eliashberg in his ICM 2006 plenary talk that the rich algebraic formalism of symplectic field theory
leads to a natural appearance of quantum and classical integrable systems, at least in the case when the contact manifold
is the prequantization space of a symplectic manifold. In this paper we generalize the definition of gravitational descendants
in SFT from circle bundles in the Morse-Bott case to general contact manifolds. After we have shown using the ideas in Okounkov
and Pandharipande (Ann Math 163(2):517–560, 2006) that for the basic examples of holomorphic curves in SFT, that is, branched covers of cylinders over closed Reeb orbits,
the gravitational descendants have a geometric interpretation in terms of branching conditions, we follow the ideas in Cieliebak
and Latschev ( [math.s6], 2007) to compute the corresponding sequence of Poisson-commuting functions when the contact manifold is the unit cotangent bundle
of a Riemannian manifold. 相似文献
12.
Jos A. Ferrari 《Annalen der Physik》1984,496(6):430-431
13.
Hai Huang Juhua Chen Yongjiu Wang Yao Jin 《International Journal of Theoretical Physics》2017,56(4):1150-1158
In this paper we consider the problem of the test massive scalar field propagating in the background of a class of wormhole space-times. Basing on the quantum scattering theory, we analyze the Schrödinger-type scalar wave equation and compute transmission coefficients for arbitrary coupling of the field to the background geometry with the WKB approximation. We numerically investigate its absorption cross section and analyze them in the high frequency regime. We find that the absorption cross section oscillates about the geometric optical value and the limit of absorption cross section is uniform in the high frequency regime. 相似文献
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15.
Satoshi Ikeda 《Annalen der Physik》1987,499(8):558-562
Some structural considerations are made on the Finslerian gravitational field: A Finslerian metrical structure such as gλχ(x, y) = γλχ(x) + hλχ(x, y) is proposed, where γλχ denotes the Riemann metric of Einstein's gravitational field, while hλχ the Finsler metric induced by the Riemann metric hij(y) of the internal field; The intrinsic behaviour of the internal variable y, which is expressed as ?i = K(x, y) yj in the internal field, is grasped by the Finslerian parallelism δyi (=0), which is reflected in the spatial structure of the external gravitational field by the mapping relation δyχ = e(x) δyi. The whole metrical Finsler connection D for gλχ(i.e., Dgλχ = 0) is determined by taking account of the intrinsic behaviour δyχ. 相似文献
16.
We investigate a relativistic self-interacting gas in the field of an external pp gravitational wave. Based on symmetry considerations we ask for those forces which are able to compensate the imprint of the gravitational wave on the macroscopic 4-acceleration of the gaseous fluid. We establish an exactly solvable toy model according to which the stationary states which characterize such a situation have negative entropy production and are accompanied by instabilities of the microscopic particle motion. These features are similar to those which one encounters in phenomena of self-organization in many-particle systems. 相似文献
17.
M. Agop Camelia Popa Anca Harabagiu 《理论物理通讯》2008,50(11):1197-1204
Considering the fractal structure of space-time, the scale relativity theory in the topological dimension DT = 2 is built. In such a conjecture, the geodesics of this space-time imply the hydrodynamic model of the quantum mechanics. Subsequently, the gauge gravitational field on a fractal space-time is given. Then, the gauge group, the gauge-covariant derivative, the strength tensor of the gauge field, the gauge-invariant Lagrangean, the field equations of the gauge potentials and the gauge energy-momentum tensor are determined. Finally, using this model, a Reissner- Nordstrom type metric is obtained. 相似文献
18.
Considering the fractal structure of space-time, the scale relativity theory in the topological dimension
DT=2 is built. In such a conjecture, the geodesics of this space-time imply the hydrodynamic model of the quantum mechanics. Subsequently, the gauge gravitational field on a fractal space-time is given. Then, the gauge group, the gauge-covariant
derivative, the strength tensor of the gauge field, the gauge-invariant
Lagrangean, the field equations of the gauge potentials and the gauge
energy-momentum tensor are determined. Finally, using this model, a
Reissner-Nordström type metric is obtained. 相似文献
19.
Quantum gauge theory of gravity is formulated based on gauge principle. Because the Lagrangian has strict local gravitational gauge symmetry, gravitational gauge theory is a perturbatively renormalizable quantum theory. Gravitational gauge interactions of scalar field are studied in this paper. In quantum gauge theory of gravity, scalar field minimal couples to gravitational field through gravitational gauge covariant derivative. Comparing the Lagrangian for scalar field in quantum gauge theory of gravity with the corresponding Lagrangian in quantum fields in curved space-time, the definition for metric in curved space-time in geometry picture of gravity can be obtained, which is expressed by gravitational gauge field. In classical level, the Lagrangian and Hamiltonian approaches are also discussed. 相似文献
20.
Scalar fields describe interesting phenomena such as Higgs bosons, dark matter and dark energy, and are found to be quite common in physical theories. These fields are susceptible to gravitational forces so that being massless is not enough to remain conformal invariant. They should also be connected directly to the scalar curvature. Because of this characteristics, we investigated the structure and interactions of scalar fields under the conformal transformations. We show how to reduce the quadratic quantum contributions in the single scalar field theory. In the multi-scalar field theories, we analyzed interactions in certain limits. We suggest a new method for stabilizing Higgs bosons.
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