论文标题
用能量和动量耦合在暗能量中缩放溶液和弱重力
Scaling solutions and weak gravity in dark energy with energy and momentum couplings
论文作者
论文摘要
我们认为，Hubble-Lemaitre扩展率的$λ$ CDM紧张$ h_0 $和聚类归一化$σ_8$，至少在原则上可以通过考虑到这种小小的和积极的早期有效的状态和弱点之间的相互作用来缓解，至少在原则上，可以通过考虑到深色能量与暗物质之间的相互作用。对于通过交换能量和动量的深色能量标量场$ ϕ $与暗物质相互作用，我们得出了Lagrangian的一般形式，允许存在缩放溶液。在这种相互作用理论的子类中，我们表明存在缩放$ ϕ $ - $ - 摩托的时代（$ ϕ $ mde），这可能会通过产生有效的高降低状态方程来减轻$ h_0 $张力。我们还研究了具有$ ϕ $ mDE的模型的扰动演变，然后研究宇宙加速度，发现与大型结构的线性生长相关的有效重力耦合可能小于低红色红移处的牛顿重力常数$ g $。暗能和暗物质之间的动量交换对于实现弱重力起着至关重要的作用，而对于存在$ ϕ $ mDE也需要能量传递。
We argue that the $Λ$CDM tensions of the Hubble-Lemaitre expansion rate $H_0$ and the clustering normalization $σ_8$ can be eased, at least in principle, by considering an interaction between dark energy and dark matter in such a way to induce a small and positive early effective equation of state and a weaker gravity. For a dark energy scalar field $ϕ$ interacting with dark matter through an exchange of both energy and momentum, we derive a general form of the Lagrangian allowing for the presence of scaling solutions. In a subclass of such interacting theories, we show the existence of a scaling $ϕ$-matter-dominated-era ($ϕ$MDE) which can potentially alleviate the $H_0$ tension by generating an effective high-redshift equation of state. We also study the evolution of perturbations for a model with $ϕ$MDE followed by cosmic acceleration and find that the effective gravitational coupling relevant to the linear growth of large-scale structures can be smaller than the Newton gravitational constant $G$ at low redshifts. The momentum exchange between dark energy and dark matter plays a crucial role for realizing weak gravity, while the energy transfer is also required for the existence of $ϕ$MDE.
