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Probing alternative cosmologies through the inverse distance ladder
Journal of Cosmology and Astroparticle Physics ( IF 6.4 ) Pub Date : 2020-10-15 , DOI: 10.1088/1475-7516/2020/10/040
Manfred Lindner 1 , Kevin Max 2 , Moritz Platscher 1 , Jonas Rezacek 1
Affiliation  

We study the implications of a combined analysis of cosmic standard candles and standard rulers on the viability of cosmological models beyond the cosmological concordance model. To this end, we employ well-established data in the form of the joint light-curve analysis supernova compilation, baryon acoustic oscillations, and cosmic microwave background data on the one hand, and a recently proposed set of quasars as objects of known brightness on the other hand. The advantage of including the latter is that they extend the local distance measures to redshifts which have previously been out of reach and we investigate how this allows one to test cosmologies beyond $\Lambda$CDM. While there exist various studies on parametric extensions of $\Lambda$CDM, we present here a comparative study of both parametric and fundamental extensions of the standard cosmology. In order to keep the scope of this manuscript contained, we focus on two particular modifications: One is the consistent theory of two interacting spin-2 objects, so-called bigravity, and the other conformal gravity, a theory of gravity that has no knowledge of fundamental length scales. The former of the two constitutes a veritable extension of General Relativity, given that it adds to the metric tensor of gravity a second dynamical tensor field. The resulting dynamics have been proposed as a self-accelerating cosmology. Conformal gravity on the other hand is a much more drastic change of the underlying gravitational theory. Its ignorance towards fundamental length scales offers a completely different approach to the origin of late time acceleration. In this sense, both models offer - in one way or another - an explanation for the dark energy problem. We perform a combined cosmological fit which provides strong constraints on these extensions. We also briefly comment on the implications of the long-standing $H_0$-tension.

中文翻译:

通过反距离阶梯探索替代宇宙学

我们研究了宇宙标准烛光和标准尺的组合分析对超越宇宙一致性模型的宇宙模型可行性的影响。为此,我们一方面采用联合光曲线分析超新星汇编、重子声波振荡和宇宙微波背景数据形式的完善数据,以及最近提出的一组类星体作为已知亮度的对象。另一方面。包含后者的优势在于它们将局部距离测量扩展到以前无法实现的红移,我们研究了这如何允许人们测试 $\Lambda$CDM 之外的宇宙学。虽然存在关于 $\Lambda$CDM 的参数扩展的各种研究,我们在此对标准宇宙学的参数扩展和基本扩展进行比较研究。为了保持本手稿的范围,我们专注于两个特定的修改:一个是两个相互作用的自旋 2 物体的一致理论,即所谓的大引力,另一个是共形引力,一个没有知识的引力理论基本长度尺度。两者中的前者构成了广义相对论的名副其实的扩展,因为它在引力的度量张量上增加了第二个动力学张量场。由此产生的动力学被提议为一种自加速宇宙学。另一方面,共形引力是基础引力理论的一个更为剧烈的变化。它对基本长度尺度的无知为后期加速度的起源提供了一种完全不同的方法。从这个意义上说,两种模型都以一种或另一种方式提供了对暗能量问题的解释。我们执行了一个组合宇宙学拟合,它对这些扩展提供了强约束。我们还简要评论了长期存在的 $H_0$ 紧张局势的影响。
更新日期:2020-10-15
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