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arXiv 0909.5416astro-ph.CO
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Ia型超新星的变G宇宙学

Varying-G Cosmology with Type Ia Supernovae

Rutger Dungan, Harrison B. Prosper

摘要:

Ia型超新星的观测结果比预期的要暗,因为它们的红移导致了宇宙正在加速膨胀的结论。被广泛接受的假设是,这种加速是由一个宇宙学常数引起的,或者更一般地说,是由弥漫在宇宙中的某种暗能量场引起的。这一假说对物理学提出了如此严峻的挑战,以至于人们有动力去探索其他的解释。在这篇论文中,我们探讨了Ia型超新星的数据是否可以用一个几乎和宇宙学常数一样古老的观点来解释,即引力的强度在宇宙时间尺度上是变化的。这个主题是一个理想的一个调查的本科物理专业,因为整个链的推理,从模型到数据分析是在数学和概念的复杂性,一个积极的本科生。

英文摘要:

The observation that Type Ia supernovae are fainter than expected given their red shifts has led to the conclusion that the expansion of the universe is accelerating. The widely accepted hypothesis is that this acceleration is caused by a cosmological constant or, more generally, some dark energy field that pervades the universe. This hypothesis presents a challenge to physics so severe that one is motivated to explore alternative explanations. In this paper, we explore whether the data from Type Ia supernovae can be explained with an idea that is almost as old as that of the cosmological constant, namely, that the strength of gravity varies on a cosmic timescale. This topic is an ideal one for investigation by an undergraduate physics major because the entire chain of reasoning from models to data analysis is well within the mathematical and conceptual sophistication of a motivated undergraduate.

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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