论文标题
解决$ h_0 $紧张，紧张的黑暗辐射在统一重力中
Addressing $H_0$ tension with emergent dark radiation in unitary gravity
论文作者
论文摘要
我们提出了一个参数扩展到$λ$ CDM，预计会强烈影响宇宙学的紧张局势。早期宇宙中的有效的暗辐射分量作为热的暗物质，然后是典型，跟踪主要状态参数，并在当前时期留下可伪造的扭转场。这张照片是由新的庞加莱轨距理论（PGT）产生的，这是最新批次中最有前途的58个PGT中的最有前途的之一，既可以使用统一的统一功率，并且没有鬼魂和tachyons。我们从系统地将其中33个PGT的宇宙学分类为最普遍的均等，占普遍性的Ostrogradsky稳定PGT的特殊情况，并具有纯粹的Yang-Mills动作。我们认为的理论包含两个传播的无质量重力，其中可能是$ j^p = 2^+$（远程引力和重力波）。耦合常数之间的阴谋消除了从字段方程中\ {\ pm 1,0 \} $中的空间曲率$ k \。我们表明，这种“ $ k $ screening”不仅限于共形重力理论。然后，弗里德曼方程式扁平，在早期不变的时代具有潜在的张力解决自由，可可靠地使其成为现代$λ$ cdm进化的吸引子状态。我们将相关的理论和有前途的特殊情况进行比较，例如$ k $扫描的理论，具有负面有效的$ K $，以及具有有效$λ$的更多传统理论和$ j^p = 0^ - $ $ $ $ $大量的graviton（暗物质候选人）。作为奖励，我们在新的扩展Weyl仪表理论（EWGT）中分析了类似约束的动作。我们表明，在宇宙学中，PGT和EWGT跨越了完全相同的经典现象学，直至其耦合常数之间的线性图，暗示了两者之间的更深层次的关系。
We propose a one-parameter extension to $Λ$CDM, expected to strongly affect cosmological tensions. An effective dark radiation component in the early universe redshifts away as hot dark matter, then quintessence, tracking the dominant equation-of-state parameter and leaving a falsifiable torsion field in the current epoch. This picture results from a new Poincaré gauge theory (PGT), one of the most promising among the latest batch of 58 PGTs found to be both power-counting renormalisable and free from ghosts and tachyons. We systematically categorise the cosmologies of 33 of these PGTs, as special cases of the most general parity-preserving, Ostrogradsky-stable PGT with a purely Yang-Mills action. The theory we consider contains two propagating massless gravitons, which may be $J^P=2^+$ (long-range gravitation and gravitational waves). A conspiracy among the coupling constants eliminates the spatial curvature $k\in\{\pm 1,0\}$ from the field equations. We show that this `$k$-screening' is not restricted to conformal gravity theories. The flat Friedmann equations are then emergent, with potentially tension-resolving freedom at the early scale-invariant epoch that reliably gives way to an attractor-like state of modern $Λ$CDM evolution. We compare with related theories and promising special cases, such as $k$-screened theories with negative-definite effective $k$, and more traditional theories with effective $Λ$ and a $J^P=0^-$ massive graviton (dark matter candidate). As a bonus, we analyse similarly constrained actions in the new extended Weyl gauge theory (eWGT). We show that in cosmology, PGT and eWGT span exactly the same classical phenomenology up to a linear map between their coupling constants, hinting at a deeper relationship between the two.
