宇宙的无量纲年龄：我们时代的一个谜
The dimensionless age of the Universe: a riddle for our time
摘要：
我们提出了宇宙学和天体物理学的有趣巧合，指向宇宙的无量纲年龄H_0*t_0接近1。尽管宇宙减速9 Gyr和加速，从那时起，我们发现H_0t*_0 = 0.96 +/- 0.01的LCDM模型，适合SN Ia数据从泛星，CMB功率谱，和重子声学振荡。同样，恒星年龄的天体物理测量和由红移和距离导出的哈勃常数指向H_0*t ~ 1.0 +/- 0.1$。在漫画进化过程中实现的H_0*t_0的可能值范围很广，这意味着我们生活在一个似乎是特殊的时代。这个“同步性问题”与通常的巧合问题并不完全相同，因为存在Omega_Matter和Omega_Lambda的组合，对于这些组合，通常的巧合问题成立，但H_0*t_0不接近1。
英文摘要：
We present the interesting coincidence of cosmology and astrophysics that points toward a dimensionless age of the universe H_0*t_0 that is close to one. Despite cosmic deceleration for 9 Gyr and acceleration since then, we find H_0t*_0 = 0.96 +/- 0.01 for the LCDM model that fits SN Ia data from Pan-STARRS, CMB power spectra, and baryon acoustic oscillations. Similarly, astrophysical measures of stellar ages and the Hubble constant derived from redshifts and distances point to H_0*t ~ 1.0 +/- 0.1$. The wide range of possible values for H_0*t_0 realized during comic evolution means that we live at what appears to be a special time. This "synchronicity problem" is not precisely the same as the usual Coincidence problem because there are combinations of Omega_Matter and Omega_Lambda for which the usual coincidence problem holds but for which H_0*t_0 is not close to 1.
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