论文标题
层叠的黑能
Cascading Dark Energy
论文作者
论文摘要
标准宇宙学模型正处于应力测试中，这要归功于基于超新星的测量值对哈勃常数$ h_ {0} $的张力与从宇宙微波背景（CMB）各向异性的值推断。关于当今宇宙加速度的许多解释都需要存在新的基本标量场，而对哈勃张力的早期暗能量（EDE）解决方案也是如此。这增加了由于不同的初始条件和耦合，多个领域在整个宇宙时间内合作促进了黑暗能量成分。在这里，这种层叠的暗能量（CDE）场景通过实现有效减少到两场模型的实现来说明，其中两个时期在宇宙学上具有重要意义。将该模型与CMB，Baryon声学振荡以及Pantheon和SH0ES型超新星的测量值进行了比较。忽略了线性扰动，发现这种情况可以缓解哈勃的张力，改善了纯粹的深色能量模型，以及Baryon声学振荡的星系测量测量之间的一致性。
The standard cosmological model is in the midst of a stress test, thanks to the tension between supernovae-based measurements of the Hubble constant $H_{0}$ and inferences of its values from Cosmic Microwave Background (CMB) anisotropies. Numerous explanations for the present-day cosmic acceleration require the presence of a new fundamental scalar field, as do Early Dark Energy (EDE) solutions to the Hubble tension. This raises the possibility that multiple fields cooperatively contribute to the dark energy component in bursts throughout cosmic time due to distinct initial conditions and couplings. Here, this Cascading Dark Energy (CDE) scenario is illustrated through a realization that effectively reduces to a two-field model, with two epochs in which dark energy is cosmologically significant. The model is compared to measurements of the CMB, baryon acoustic oscillations, as well as both PANTHEON and SH0ES observations of Type-Ia supernovae. Neglecting the linear perturbations, it is found that this scenario ameliorates the Hubble tension, improving over purely late-time models of dark energy, and the agreement between the galaxy survey measurements of baryon acoustic oscillations.
