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arXiv 1009.3572gr-qc
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完美流体暗物质

Perfect Fluid Dark Matter

F. Rahaman, K. K. Nandi, A. Bhadra, M. Kalam, K. Chakraborty

摘要:

在广义相对论的框架下,以平坦的自转曲线为输入,将星系晕区的物质含量视为理想流体,得到了星系晕区的时空度规。我们发现,由此产生的度规是一个非相对论性暗物质诱导的时空嵌入在一个静态的弗里德曼-勒梅特-罗伯逊-沃克宇宙。这意味着平坦的旋转曲线不仅导致了暗物质的存在,而且还暗示了宇宙的背景几何。平坦的旋转曲线和要求暗物质是非奇异的共同表明一个(几乎)平坦的宇宙,这是现代宇宙学观测所青睐的。得到了暗物质晕的能量密度和压强的表达式,进而得到了暗物质的物态方程。还分析了解决方案的各个其他方面。

英文摘要:

Taking the flat rotation curve as input and treating the matter content in the galactic halo region as perfect fluid, we obtain space time metric at the galactic halo region in the framework of general relativity. We find that the resultant metric is a non-relativistic-dark-matter-induced space-time embedded in a static Friedmann-Lemaître-Robertson-Walker universe. This means that the flat rotation curve not only leads to the existence of dark matter but also suggests the background geometry of the universe. The flat rotation curve and the demand that the dark matter be non-exotic together indicate a (nearly) flat universe as favored by the modern cosmological observations. We obtain the expressions for energy density and pressure of dark matter halo and consequently the equation of state of dark matter. Various other aspects of the solution are also analyzed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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