论文标题
热摩擦作为哈勃和大规模结构张力的解决方案
Thermal Friction as a Solution to the Hubble and Large-Scale Structure Tensions
论文作者
论文摘要
热摩擦为哈勃和大规模结构（LSS）张力提供了有希望的解决方案。这种额外的摩擦作用于早期宇宙中的标量场，并将其能量密度提取到黑暗辐射中，累积效应与早期的暗能量（EDE）情况相似。深色辐射以最小的必要速度自动红移，以改善哈勃张力。另一方面，向宇宙增加额外的辐射可以改善LSS张力。我们根据宇宙微波背景（CMB），Baryon声学振荡和超新星数据探讨了该模型，包括SH0ES $ H_0 $测量和我们分析中的Dark Energy Survey Y1数据释放。我们的结果表明，对标量场在非常高的红移下转换为深色辐射的制度偏爱，有效地渐近地转换为额外的自我相互作用辐射物种，而不是像EDE一样的注入。在此极限下，热摩擦可以缓解哈勃和LSS紧张局势，但不能解决它们。我们发现，当在接近物质辐射平等的红移处注射时，这种偏好的来源是CMB数据与深色辐射的线性密度扰动的不相容性。
Thermal friction offers a promising solution to the Hubble and the large-scale structure (LSS) tensions. This additional friction acts on a scalar field in the early universe and extracts its energy density into dark radiation, the cumulative effect being similar to that of an early dark energy (EDE) scenario. The dark radiation automatically redshifts at the minimal necessary rate to improve the Hubble tension. On the other hand, the addition of extra radiation to the Universe can improve the LSS tension. We explore this model in light of cosmic microwave background (CMB), baryon acoustic oscillation and supernova data, including the SH0ES $H_0$ measurement and the Dark Energy Survey Y1 data release in our analysis. Our results indicate a preference for the regime where the scalar field converts to dark radiation at very high redshifts, asymptoting effectively to an extra self-interacting radiation species rather than an EDE-like injection. In this limit, thermal friction can ease both the Hubble and the LSS tensions, but not resolve them. We find the source of this preference to be the incompatibility of the CMB data with the linear density perturbations of the dark radiation when injected at redshifts close to matter-radiation equality.
