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101.
基于现代时空理念的区域协调发展质量探讨--以西安市为例 总被引:3,自引:0,他引:3
提出现代时空理念指导下区域协调发展质量的概念,即从时空两个层面,对区域经济、社会和生态这一复杂系统的协调发展的综合评价结果,建立其概念模型.主要从时间维上对西安协调发展质量进行系统评价,并结合评价结果给出了五项政策性建议. 相似文献
102.
卢民强 《华东理工大学学报(自然科学版)》1997,23(4):494-498
在FRW时空中,对畴壁、弦、单极子这三种拓扑缺陷导出了运动方程,其中考虑了标量场与标量曲率的耦合,特别是对de Sitter时空,可将偏微分方程简化为常微分方程。 相似文献
103.
We find asymptotic expansions in the “string mass” μ for μ-deformed Γ-functions and Neumann coefficients characterizing the
three-string vertex in the light-cone gauge of the field theory of open superstrings on a maximally supersymmetric pp-wave
background.
Dedicated to the 80th birthday of Academician Anatolii Alekseevich Logunov
__________
Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 149, No. 3, pp. 381–385, December, 2006. 相似文献
104.
105.
106.
A. López-Ortega 《General Relativity and Gravitation》2006,38(12):1747-1770
Using the monodromy method we calculate the asymptotic quasinormal frequencies of an electromagnetic field moving in D-dimensional Schwarzschild and Schwarzschild de Sitter black holes (D ≥ 4). For the D-dimensional Schwarzschild anti-de Sitter black hole we also compute these frequencies with a similar method. Moreover, we calculate the electromagnetic normal modes of the D-dimensional anti-de Sitter spacetime. 相似文献
107.
Narayan Chandra Chakraborty Subenoy Chakraborty 《General Relativity and Gravitation》2002,34(4):453-459
The generalized Brans-Dicke (BD) Cosmology has been studied for Bianchi-I, Bianchi-III and Kantowski-Sachs anisotropic space-time models. Solutions have been obtained for radiation-dominated era, stiff matter epoch and other equations of state. 相似文献
108.
In this paper, we investigate the solutions of the hyperbolic Yamabe problem for the(1 + n)-dimensional Minkowski space-time. More precisely speaking, for the case of n = 1, we derive a general solution of the hyperbolic Yamabe problem; for the case of n = 2, 3, we study the global existence and blowup phenomena of smooth solutions of the hyperbolic Yamabe problem;while for general multi-dimensional case n ≥ 2, we discuss the global existence and non-existence for a kind of exact solutions of the hyperbolic Yamabe problem. 相似文献
109.
In this paper, we investigate complete spacelike hypersurfaces in the de Sitter space with constant k-th mean curvature and two distinct principal curvatures one of which is simple. We obtain some characterizations of the Riemannian product H1(c1)×Sn−1(c2) or Hn−1(c1)×S1(c2) in the de Sitter space . 相似文献
110.
Alain Bachelot 《Journal de Mathématiques Pures et Appliquées》2011,96(6):527-554
This paper deals with the Klein–Gordon equation on the Poincaré chart of the 5-dimensional Anti-de Sitter universe. When the mass μ is larger than , the Cauchy problem is well-posed despite the loss of global hyperbolicity due to the time-like horizon. We express the finite energy solutions in the form of a continuous Kaluza–Klein tower and we deduce a uniform decay as . We investigate the case , ν∈N?, which encompasses the gravitational fluctuations, ν=4, and the electromagnetic waves, ν=2. The propagation of the wave front set shows that the horizon acts like a perfect mirror. We establish that the smooth solutions decay as , and we get global Lp estimates of Strichartz type. When ν is even, there appears a lacuna and the equipartition of the energy occurs at finite time for the compactly supported initial data, although the Huygens principle fails. We address the cosmological model of the negative-tension Minkowski brane, on which a Robin boundary condition is imposed. We prove the hyperbolic mixed problem is well-posed and the normalizable solutions can be expanded into a discrete Kaluza–Klein tower. We establish some L2−L∞ estimates in suitable weighted Sobolev spaces. 相似文献