论文标题
减轻$ h_0 $张力，并具有新的重力标量张量理论
Alleviating $H_0$ Tension with New Gravitational Scalar Tensor Theories
论文作者
论文摘要
我们研究了新的引力标量张量理论的宇宙学应用，并根据$ H_0 $张力进行了分析。在这些理论中，Lagrangian在特定组合中包含RICCI标量及其第一个和第二个衍生物，使它们不受鬼魂的态度，因此对应于健康的Bi-Scalar扩展。 We examine two specific models, and for particular choices of the model parameters we find that the effect of the additional terms is negligible at high redshifts, obtaining a coincidence with $Λ$CDM cosmology, however as time passes the deviation increases and thus at low redshifts the Hubble parameter acquires increased values ($H_0\approx 74 km/s/Mpc$) in a controlled way.这种行为背后的机制是一个事实，即有效的深色能量方程式参数表现出幻象行为，这意味着更快的扩展，这是能够减轻$ H_0 $张力的理论要求之一。最后，我们将模型与宇宙计时仪（CC）数据对抗，显示在1 $σ$置信度以内的完全一致性。
We investigate the cosmological applications of new gravitational scalar-tensor theories and we analyze them in the light of $H_0$ tension. In these theories the Lagrangian contains the Ricci scalar and its first and second derivatives in a specific combination that makes them free of ghosts, thus corresponding to healthy bi-scalar extensions of general relativity. We examine two specific models, and for particular choices of the model parameters we find that the effect of the additional terms is negligible at high redshifts, obtaining a coincidence with $Λ$CDM cosmology, however as time passes the deviation increases and thus at low redshifts the Hubble parameter acquires increased values ($H_0\approx 74 km/s/Mpc$) in a controlled way. The mechanism behind this behavior is the fact that the effective dark-energy equation-of-state parameter exhibits phantom behavior, which implies faster expansion, which is one of the theoretical requirements that are capable of alleviating the $H_0$ tension. Lastly, we confront the models with Cosmic Chronometer (CC) data showing full agreement within 1$σ$ confidence level.
