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We derive the integral inequality of a Randers metric with isotropic S-curvature in terms of its navigation representation. Using the obtained inequality we give some rigidity results under the condition of Ricci curvature. In particular, we show the following result: Assume that an n-dimensional compact Randers manifold (M, F) has constant S-curvature c. Then (M, F) must be Riemannian if its Ricci curvature satisfies that Ric 〈 -(n - 1)c^2. 相似文献
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<正>目前使用的国际单位制(SI)于1960年正式颁布,其历史渊源来自于法国大革命时代的米制。新的度量衡系统存在一个统一度量的起点——米——用此定义长度、体积和质量。米的定义来自于一个自然恒量——通过巴黎的地球子午线从北极到赤道距离的一千万分之一。体积和质量的单位由此推导出来, 相似文献
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Metric of Rotating Charged Spherical Mass in Vacuum for Vector Graviton Metric Theory of Gravitation
QIAN Shang-Wu ZHONG Zai-Zhe GU Zhi-Yu 《理论物理通讯》2005,44(5):855-857
Based on the vector graviton metric theory of gravitation (VGM) suggested by one of the authors of this article, using the method of null tetrad and analytic continuation, this paper gives the metric of the rotating charged spherical mass in VGM. The result shows once again that a replacement of G by G*= G(1 - G M / 2r ) in general relativity will yield the corresponding result in VGM for the metric in vacuum. 相似文献
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