用百万颗超新星测量重子声学振荡
Measuring Baryon Acoustic Oscillations with Millions of Supernovae
摘要：
由于Ia型超新星（SNe）在星系中爆炸，原则上它们可以作为与其宿主相同的大尺度结构的示踪剂来测量重子声学振荡（BAO）。为了实现这一点，必须在大部分天空中获得密集的综合SNe采样，这可能只能通过未来的项目（如大型综合巡天望远镜）在光度上实现。SNBAO的优点是SNe比星系有更均匀的光度和更精确的光度红移，但缺点是它们是短暂的，在高红移时很难大量获得。我们发现，一个半天空测光SN调查红移z = 0.8是能够测量的SN空间功率谱中的重子签名。虽然来自SN BAO的暗能量约束较弱，但它们可以显著改善来自相同数据的SN光度距离的结果，并且两者的组合不再对宇宙微波背景先验敏感。
英文摘要：
Since type Ia Supernovae (SNe) explode in galaxies, they can, in principle, be used as the same tracer of the large-scale structure as their hosts to measure baryon acoustic oscillations (BAOs). To realize this, one must obtain a dense integrated sampling of SNe over a large fraction of the sky, which may only be achievable photometrically with future projects such as the Large Synoptic Survey Telescope. The advantage of SN BAOs is that SNe have more uniform luminosities and more accurate photometric redshifts than galaxies, but the disadvantage is that they are transitory and hard to obtain in large number at high redshift. We find that a half-sky photometric SN survey to redshift z = 0.8 is able to measure the baryon signature in the SN spatial power spectrum. Although dark energy constraints from SN BAOs are weak, they can significantly improve the results from SN luminosity distances of the same data, and the combination of the two is no longer sensitive to cosmic microwave background priors.
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