超越H_0和q_0：宇宙学不再只是两个数字
Beyond H_0 and q_0: Cosmology is no longer just two numbers
摘要：
几十年来，H_0和q_0是宇宙学的追求，因为它们承诺在不参考特定宇宙学框架的情况下描述我们的“世界模型”。使用蒙特卡罗模拟，我们表明，q_0不能直接测量使用距离指标的准确性（没有偏离其真实值）和精度（小误差条）。虽然H_0可以准确和精确地测量，为了避免在其直接测量中的小偏差（5%的数量级），我们证明了对H_0和Omega_M（假设平坦度和w = -1）是两个参数的更好选择，即使我们的世界模型不是精确的LambdaCDM。我们通过对超新星的构成集的分析，间接地推断出q_0 = -0.57+/-0.04。最后，我们表明，它可能直接确定q_0的准确性和精度使用的时间依赖性的红移（“红移漂移”）。
英文摘要：
For decades, H_0 and q_0 were the quest of cosmology, as they promised to characterize our "world model" without reference to a specific cosmological framework. Using Monte Carlo simulations, we show that q_0 cannot be directly measured using distance indicators with both accuracy (without offset away from its true value) and precision (small error bar). While H_0 can be measured with accuracy and precision, to avoid a small bias in its direct measurement (of order 5%) we demonstrate that the pair H_0 and Omega_M (assuming flatness and w = -1) is a better choice of two parameters, even if our world model is not precisely LambdaCDM. We illustrate with analysis of the Constitution set of supernovae and indirectly infer q_0 = -0.57+/-0.04. Finally, we show that it may be possible to directly determine q_0 with both accuracy and precision using the time dependence of redshifts ("redshift drift").
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。
