这就是弗里德曼方程(The Friedmann Equation)。根据曲率不同,它显示了具有RW度规的宇宙的尺度因子与能量密度之间的关系,它们随着时间演化的方式应当是这方程的解。有了这一个解之后,通过之前得到的尺度因子和红移的关系,不仅可以顺利得到观测者观测到的光子正确的发射时间从而得到固有距离,还允许观测者们将观测和理论结合...
Moreover, classical big bang cosmological models based on Friedmann's equation, without the need for quantum gravity, when globalized to all-time solutions, show that the universe did not begin at the big bang. Thus encoded in Friedmann's equation is previously undiscovered information about how ...
The Friedmann equation tells us about the expansion of space in homogeneous and isotropic models of the universe. Depending on different curvature constant values, we can have a Closed, Open or Flat Universe.Print Page Previous Next Advertisements...
Define Friedmann equations. Friedmann equations synonyms, Friedmann equations pronunciation, Friedmann equations translation, English dictionary definition of Friedmann equations. n the density of matter that would be required to halt the expansion of th
Assuming a flat universe expanding under a constant pressure and combining the first and the second Friedmann equations, a new equation, describing the evolution of the scale factor, is derived. The equation is a general kinematic equation. It includes all the ingredients composing the universe. ...
1.We start from the metric containing a varying speed of light to investigate the cosmological evolution and give the modifiedFriedmann equations.本文从含有变光速的度规出发考虑了宇宙的演化并给出了修正的弗里德曼方程。 2)friedmann equation弗里德曼方程 ...
Thermodynamic Behavior of Friedmann Equation at Apparent :弗里德曼方程在表观热力学行为.pdf 2014-07-13上传 Thermodynamic Behavior of Friedmann Equation at Apparent :弗里德曼方程在表观热力学行为of,at 文档格式: .pdf 文档大小: 153.75K 文档页数:
The first two equations are the standard Friedmann equations for generic matter content, while the final equation fixes T(0) in terms of density and pressure. Therefore, the low-energy DFT limit with a stabilized dilaton is consistent with intro- ducing any type of matter (including extended ...
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Keywords:Emergentphenomenon,Debyemodel,Zero—pointenergy,ModifiedFriedmannequation 0 引言 在经典广义相对论中,黑洞是一个特殊的时 空区域,任何物质,包括光在内都不能从中逃出。 因此人们一直认为,黑洞是一个只进不出的时空 区域。但是到了20世纪60—70年代,Hawking ...