Late-time Universe, H0-tension, and unparticles

被引:8
|
作者
Abchouyeh, Maryam Aghaei [1 ,2 ]
van Putten, Maurice H. P. M. [1 ]
机构
[1] Sejong Univ, Dept Phys & Astron, 98 Gunja Dong, Seoul 143747, South Korea
[2] Ulsan Natl Univ Sci & Technol UNIST, Sch Nat Sci, Dept Phys, Ulsan 44919, South Korea
关键词
HUBBLE PARAMETER; SCALE; EXPANSION; DYNAMICS;
D O I
10.1103/PhysRevD.104.083511
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Lambda cold dark matter (Lambda CDM) is increasingly facing challenges in late-time cosmology, notably in the Hubble parameter H(z) at redshift zero known as H-0-tension. Extensions to Lambda CDM have been approached mostly by models with an extra parameter. In this work, we provide a framework for evaluating the viability of models of late-time cosmology by investigating unparticle cosmology as a case study. Unparticle cosmology proposes a scale invariant contribution by a dimensionless parameter delta. We focus on H-0-tension in comparison with scale invariant and Lambda CDM models. The dynamical behavior of unparticle cosmology with and without a cosmological constant shows that for most values of delta is an element of [-6, 1] (corresponding to d(u) is an element of[-2, 3/2]), the late-time Universe will be. and matter dominated, respectively, with negligible contribution of unparticles. It predicts HozTHORN in the future to be zero or constant, the latter pointing to a stable de Sitter phase for our Universe. Our data analysis shows delta = -2.06 +/- 0.46 as the best fit to the data. Consequently, the conventional value of d(u) = 3/2 equivalent to delta = 1 is ruled out by 6.6 sigma. However, there is a pronounced gap between the models and what is demanded by observational data in the qQ-diagram for all delta. We conclude that unparticle cosmology fails to come to the rescue of challenges to latetime Lambda CDM, but it provides a pointer to holographic dark energy.
引用
收藏
页数:18
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