论文标题
筛选的第五力量也降低了TRGB校准的哈勃常数
Screened fifth forces lower the TRGB-calibrated Hubble constant too
论文作者
论文摘要
哈勃常数的局部距离梯子测量需要在低红移和类型的IA超新星之间的几何距离之间建立联系，这可以通过lumuminity的关系（lumuminity的关系）或红色巨型分支（TRGB）特征（TRGB）的尖端（TRGB）的尖端来实现。通过更改距离梯子来工作的哈勃张力的任何潜在解决方案都必须与CMB校准Cepheid和TRGB $ H_0 $校准。在本文中，我们扩展了筛选的第五力量模型（Desmond等人，2019年），以涵盖TRGB框架。第五力降低了TRGB光度，因此降低了推断的$ H_0 $，要求校准光度的恒星（当前在LMC中）平均比校准超新星幅度的星星筛选。我们表明，即使在灭绝LMC的悲观假设下，也可以在未经筛选的RGB恒星$ \ sim $ 0.2 $ 0.2的牛顿重力的第五力强度方面与普朗克完全保持一致。通过将头孢菌和TRGB距离测量值与附近星系进行比较，允许这一点。我们的结果表明，Desmond等人（2019年）的框架比最初证明的更具用途，能够改善第二个方面的哈勃张力。
The local distance ladder measurement of the Hubble constant requires a connection between geometric distances at low redshift and Type Ia supernovae in the Hubble flow, which may be achieved through either the Cepheid period--luminosity relation or the luminosity of the Tip of the Red Giant Branch (TRGB) feature of the Hertzsprung--Russell diagram. Any potential solution to the Hubble tension that works by altering the distance ladder must produce consistency of both the Cepheid and TRGB $H_0$ calibrations with the CMB. In this paper we extend our models of screened fifth forces (Desmond et al 2019) to cover the TRGB framework. A fifth force lowers TRGB luminosity, so a reduction in inferred $H_0$ requires that the stars that calibrate the luminosity---currently in the LMC---are on average less screened than those that calibrate the supernova magnitude. We show that even under pessimistic assumptions for the extinction to the LMC, full consistency with Planck can be achieved for a fifth force strength in unscreened RGB stars $\sim$0.2 that of Newtonian gravity. This is allowed by the comparison of Cepheid and TRGB distance measurements to nearby galaxies. Our results indicate that the framework of Desmond et al (2019) is more versatile than initially demonstrated, capable of ameliorating the Hubble tension on a second front.
