论文标题
黑暗能量是由测量中的偏差解释的
Dark energy explained by a bias in the measurements
论文作者
论文摘要
典型的宇宙学模型基于假设空间是均匀的。但是，空间包含集中物质的过度密度区域，几乎留下了几乎没有空隙的不足区域。通过对SNIA的测量，已经确定了宇宙比例因素的演变。由于此类事件发生在物质中，因此我们可能希望大多数SNIA都位于过度密集的地区。这意味着，仅考虑来自过度密度区域的信息，以偏见的方式建立了规模因素的演变，不包括来自少量地区的不足区域。我们开发了一个简单的模型来分析这种偏见的效果，并表明它导致在爱因斯坦等方程中出现了一种新的张量，这可以解释宇宙膨胀的明显加速。我们进一步表明，该张量倾向于与FLRW度量张量成正比，并且比例的常数在定量上对应于所测量的宇宙学常数，其精度很高。我们最终解释了为什么这些属性对于确定宇宙动力学的其他技术（例如Baryon声学振荡）仍然有效。
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.
