In a recent work we have argued that noisy energy momentum diffusion due to space-time discreteness at the Planck scale (naturally expected to arise from quantum gravity) can be responsible for the generation of a cosmological constant at the electro-weak phase transition era of the cosmic evolution. Simple dimensional analysis and an effectively Brownian description of the propagation of fundamental particles on a granular background yields a cosmological constant of the order of magnitude of the observed value, without fine tuning. While the energy diffusion is negligible for matter in standard astrophysical configurations (from ordinary stars to neutron stars), here we argue that a similar diffusion mechanism could, nonetheless, be important for black holes. If such effects are taken into account, two observational puzzles might be solved by a single mechanism: the ‘\(H_0\) tension’ and the relatively low rotational spin of the black holes detected via gravitational wave astronomy.

在最近的工作中，我们认为，由于普朗克尺度上的时空离散（自然预期是由量子引力引起的）而引起的噪声能量动量扩散，可能是导致电子弱相变时代宇宙常数产生的原因。宇宙进化。简单的尺寸分析和对基本粒子在颗粒背景上的有效传播的有效布朗描述产生了观测值数量级的宇宙学常数，而无需进行微调。尽管标准天体物理结构（从普通恒星到中子星）的物质能量扩散可以忽略不计，但在这里我们认为类似的扩散机制对于黑洞可能仍然很重要。如果考虑到这种影响，\（H_0 \）张力”和通过重力波天文学检测到的黑洞相对较低的自旋。