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arXiv 0801.1888astro-ph
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引力参数G的可能宇宙学时间依赖性对Ia型超新星峰值光度的影响

Effect of a possible cosmological time dependence of the gravitational parameter G on the peak luminosity of type Ia supernovae

A. Tartaglia, N. Radicella

摘要:

宇宙的宇宙膨胀影响着所有物理系统的行为,在引力束缚的情况下,可以对应或模仿依赖于时间的牛顿常数。在这里,我们讨论的情况下,一个局部球形的质量分布嵌入在一个通用的罗伯逊沃克宇宙。选择最合适的度量张量的问题,并假设当地的时间尺度是远远低于宇宙的,我们表明,G几乎是不受影响的,从而离开Ia型超新星的绝对幅度不变的所有时代。

英文摘要:

The cosmological expansion of the universe affects the behaviour of all physical systems and, in the case of gravitationally bound ones, could correspond to or mimic a time dependent Newton's constant. Here we discuss the case of a locally spherical mass distribution embedded in a generic Robertson Walker universe. Choosing the most appropriate metric tensor for the problem and assuming that the local time scale is much much lower than the cosmic one, we show that G is practically unaffected thus leaving the absolute magnitude of type Ia supernovae unaltered at all epochs.

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