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71.
将量子力学的deBroglieBohm(dBB)解释引入BransDicke(BD)理论中.在小超空间近似下,求出了Brans类型1量子黑洞的波函数.利用dBB解释求得Brans类型1的量子轨迹和量子势.在量子黑洞背景几何上,研究了径向光的行为.发现Brans类型1量子化后的黑洞“温度”是奇异的.另外,由于BD引力理论在BD参数ω趋于无穷大时应与广义相对论等价,因而Schwarzschild黑洞在dBB量子化后“温度”也是奇异的.这似乎意味着dBB量子化不能应用于黑洞.
关键词:
deBroglie-Bohm解释
Brans-Dicke引力理论
量子轨迹
小超空间近似 相似文献
72.
K. S. Adhav M. R. Ugale C. B. Kale M. P. Bhende 《International Journal of Theoretical Physics》2009,48(1):178-182
We have obtained an exact solution of the vacuum Brans-Dicke (Phys. Rev. 124:925, 1961) field equations for the metric tensor of a spatially homogeneous and anisotropic model. Some physical properties of the
model are also studied. 相似文献
73.
74.
The main purpose of the present paper is to explore hypersurface homogenous space time in Brans Dicke theory of gravitation in terms of the dark energy source. To obtain solution of the field equation, we have taken into account the relation between and the average scale factor a. The volumetric expansions are considered to get deterministic solutions. Physical properties of the models are also discussed in detail. 相似文献
75.
Motivated by the experimental realization of Dicke model in optical cavities, we model an optomechanical system consisting of two-level BEC atoms with transverse pumping. We investigate the transition from normal and inverted state to the superradiant phase through a detailed study of the phase portraits of the system. The rich phase portraits generated by analytical arguments display two types of superradiant phases, regions of coexistence and some portion determining the persistent oscillations. We study the time evolution of the system from any phase and discuss the role of mirror frequency in reaching their attractors. Further, we add an external mechanical pump to the mirror which is capable of changing the mirror frequency through radiation pressure and study the impact of the pump on the phase portraits and the dynamics of the system. We find the external mirror frequency changing the phase portraits and even shifting the critical transition point, thereby predicting a system with controllable phase transition. 相似文献
76.
With the help of Nordtvedt's scalar tensor theory an exact analytic model of a non–minimally coupled scalar field cosmology in which the gravitational coupling G and the Hubble factor H oscillate during the radiation era is presented. A key feature is that the oscillations are confined to the early stages of the radiation dominated era with G approaching its present constant value while H becoming a monotonically decreasing function of time. The Brans Dicke parameter is chosen to be a function of Brans Dicke scalar field so that no conflict with observational constraints regarding its present value arises. 相似文献
77.
78.
F. Rahaman M. Kalam K. A. Rahman S. Chakraborti 《General Relativity and Gravitation》2007,39(7):945-956
Recently, Dadhich et al. (Phys. Lett. B 487, 1, 2000) have discovered a black hole solution localized on a three brane in five dimensional gravity in the Randall–Sundrum
scenario. In this article, we develop a new class of thin shell wormhole by surgically grafting above two black hole spacetimes.
Various aspects of this thin wormhole are also analyzed. 相似文献
79.
Nurettin Pirinççioglu İrfan Açıkgöz Mustafa Saltı 《International Journal of Theoretical Physics》2007,46(5):1318-1333
In this work, in order to compute energy and momentum distributions (due to matter plus fields including gravitation) associated with the Brans–Dicke wormhole solutions we consider Møller’s energy-momentum complexes both in general relativity and the teleparallel gravity, and the Einstein energy-momentum formulation in general relativity. We find exactly the same energy and momentum in three of the formulations. The results obtained in teleparallel gravity is also independent of the teleparallel dimensionless coupling parameter, which means that it is valid not only in the teleparallel equivalent of general relativity, but also in any teleparallel model. Furthermore, our results also sustains (a) the importance of the energy-momentum definitions in the evaluation of the energy distribution of a given spacetime and (b) the viewpoint of Lessner that the Møller energy-momentum complex is a powerful concept of energy and momentum. (c) The results calculated supports the hypothesis by Cooperstock that the energy is confined to the region of non-vanishing energy-momentum tensor of matter and all non-gravitational fields. 相似文献
80.
In this paper, we investigate the non-equilibrium dynamical phases of the two-atom Dicke model, which can be realized in a two species Bose–Einstein condensate interacting with a single light mode in an optical cavity. Apart from the usual non-equilibrium normal and inverted phases, a non-equilibrium mixed phase is possible which is a combination of normal and inverted phase. A new kind of dynamical phase transition is predicted from non-superradiant mixed phase to the superradiant phase which can be achieved by tuning the two different atom–photon couplings. We also show that a dynamical phase transition from the non-superradiant mixed phase to the superradiant phase is forbidden for certain values of the two atom–photon coupling strengths. 相似文献