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Marginal evidence for cosmic acceleration from Type Ia supernovae

机译:Ia型超新星宇宙加速的边际证据

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摘要

The ‘standard’ model of cosmology is founded on the basis that the expansion rate of the universe is accelerating at present — as was inferred originally from the Hubble diagram of Type Ia supernovae. There exists now a much bigger database of supernovae so we can perform rigorous statistical tests to check whether these ‘standardisable candles’ indeed indicate cosmic acceleration. Taking account of the empirical procedure by which corrections are made to their absolute magnitudes to allow for the varying shape of the light curve and extinction by dust, we find, rather surprisingly, that the data are still quite consistent with a constant rate of expansion.
机译:宇宙学的“标准”模型是建立在当前宇宙膨胀率正在加速的基础上的,正如最初从Ia型超新星的哈勃图推论得出的那样。现在有一个更大的超新星数据库,因此我们可以进行严格的统计测试,以检查这些“可标准化的蜡烛”是否确实指示宇宙加速。考虑到经验过程,通过对它们的绝对值进行校正以允许变化的光曲线形状和灰尘消灭,我们非常惊讶地发现,数据仍然与恒定的膨胀率非常一致。

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