arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.11044astro-ph.CO
收藏

由测量偏差解释的暗能量

Dark energy explained by a bias in the measurements

Vincent Deledicque

摘要:

典型的宇宙学模型是基于空间是均匀的假设。然而,空间包含了物质集中的过密区域,留下了几乎是空的欠密区域。宇宙尺度因子的演化已经从SNIa的测量中建立起来。由于这些事件发生在物质存在的区域,我们可以预期大多数SNIa位于过密区域。这意味着比例因子的演变是以有偏见的方式建立的,只考虑来自过密区域的信息,不包括来自欠密区域的信息。我们开发了一个简单的模型来分析这种偏差的影响,并表明它导致了广义相对论的爱因斯坦方程中出现了一个新的张量,它可以解释宇宙膨胀的明显加速。我们进一步表明,这个张量往往是成比例的FLRW度规张量,并定量对应于测量的宇宙学常数的比例常数具有显着的精度。最后,我们解释了为什么这些属性仍然有效的其他技术用于确定宇宙的动力学,如重子声学振荡。

英文摘要:

Typical cosmological models are based on the postulate that space is homogeneous. Space however contains overdense regions in which matter is concentrating, leaving underdense regions of almost void. The evolution of the scale factor of the universe has been established from measurements on SNIa. Since such events occur in regions were matter is present, we may expect that most of the SNIa are located in overdense regions. This means that the evolution of the scale factor has been established in a biased manner, by considering only information coming from overdense regions, excluding the one from the underdense regions. We develop a simple model to analyze the effect of this bias, and show that it leads to the appearance of a new tensor in the Einstein equation of general relativity, which can account for the apparent acceleration of the expansion of the universe. We further show that this tensor tends to be proportional to the FLRW metric tensor, and that the constant of proportionality quantitatively corresponds to the measured cosmological constant with a remarkable accuracy. We finally explain why these properties remain valid for other techniques used in determining the dynamics of the universe, such as the baryon acoustic oscillations.

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。

↑