The interacting vacuum and tensions: A comparison of theoretical models

被引：3
作者：
Sebastianutti, Marco [1 ]
Hogg, Natalie B. [2 ,3 ]
Bruni, Marco [4 ,5 ]
机构：
[1] Univ Sussex, Dept Phys & Astron, Brighton BN1 9QH, England
[2] Univ Montpellier, Lab Univers & Particules Montpellier, Montpellier, France
[3] CNRS, Montpellier, France
[4] Univ Portsmouth, Inst Cosmol & Gravitat, Burnaby Rd, Portsmouth PO1 3FX, England
[5] Ist Nazl Fis Nucl, Sez Trieste, Via Valerio 2, I-34127 Trieste, Italy
来源：
PHYSICS OF THE DARK UNIVERSE | 2024年 / 46卷
基金：
英国科学技术设施理事会;
关键词：
Dark energy theory; Cosmological perturbation theory in GR and; beyond; SPECTROSCOPIC SURVEY MEASUREMENT; ANISOTROPIC POWER SPECTRUM; RED GALAXY SAMPLE; GAUGE TRANSFORMATIONS; REDSHIFTS; 0.6; GROWTH-RATE; PERTURBATIONS; BAO; INVARIANCE; COVARIANT;
D O I：
10.1016/j.dark.2024.101546
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We analyse three interacting vacuum dark energy models with the aim of exploring whether the H 0 and a 8 tensions can be simultaneously resolved in such models. We present the first ever derivation of the covariant gauge -invariant perturbation formalism for the interacting vacuum scenario, and, for the sub -class of geodesic cold dark matter models, connect the evolution of perturbation variables in this approach to the familiar cosmological observables. We show how H 0 and a 8 evolve in three interacting vacuum models: firstly, a simple linear coupling between the vacuum and cold dark matter; secondly, a coupling which mimics the behaviour of a Chaplygin gas; and finally a coupling which mimics the Shan-Chen fluid dark energy model. We identify, if any, the regions of parameter space which would correspond to a simultaneous resolution of both tensions in these models. When constraints from observational data are added, we show how all the models described are constrained to be close to their ACDM limits.
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页数：17
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