Observational constraints on one-parameter dynamical dark-energy parametrizations and the H0 tension

被引：126

作者：

Yang, Weiqiang ^{[1
]}

Pan, Supriya ^{[2
]}

Di Valentino, Eleonora ^{[3
]}

Saridakis, Emmanuel N. ^{[4
,5
]}

Chakraborty, Subenoy ^{[6
]}

机构：

[1] Liaoning Normal Univ, Dept Phys, Dalian 116029, Peoples R China

[2] Presidency Univ, Dept Math, 86-1 Coll St, Kolkata 700073, India

[3] Univ Manchester, Jodrell Bank Ctr Astrophys, Sch Phys & Astron, Oxford Rd, Manchester M13 9PL, Lancs, England

[4] Natl Tech Univ Athens, Phys Div, 15780 Zografou Campus, Athens, Greece

[5] Baylor Univ, Phys Dept, CASPER, Waco, TX 76798 USA

[6] Jadavpur Univ, Dept Math, Kolkata 700032, W Bengal, India

来源：

PHYSICAL REVIEW D | 2019年 / 99卷 / 04期

基金：

欧洲研究理事会; 中国国家自然科学基金;

关键词：

EQUATION-OF-STATE; EVOLUTION; CFHTLENS; UNIVERSE; QUINTOM; PLANCK; PROBE; I;

D O I：

10.1103/PhysRevD.99.043543

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The phenomenological parametrizations of dark-energy (DE) equations of state can be very helpful, since they allow for the investigation of its cosmological behavior despite the fact that its underlying theory is unknown. However, although there has been a large amount of research on DE parametrizations which involve two or more free parameters, the one-parameter parametrizations seem to be underestimated. We perform a detailed observational confrontation of five one-parameter DE models, with observational data from cosmic microwave background (CMB), Joint light-curve analysis sample from Supernovae Type Ia observations (JLA), baryon acoustic oscillations (BAO) distance measurements, and cosmic chronometers (CC). We find that all models favor a phantom DE equation of state at present time, while they lead to H-0 values in perfect agreement with its direct measurements and therefore they offer an alleviation to the H-0-tension. Finally, performing a Bayesian analysis we show that although Lambda CDM cosmology is still favored, one-parameter DE models have similar or better efficiency in fitting the data comparing to two-parameter DE parametrizations, and thus they deserve a thorough investigation.

引用

页数：14

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