Interacting dark energy with time varying equation of state and the H0 tension

被引：142

作者：

Yang, Weiqiang ^{[1
]}

Mukherjee, Ankan ^{[2
]}

Di Valentino, Eleonora ^{[3
]}

Pan, Supriya ^{[4
]}

机构：

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

[2] Indian Inst Sci Educ & Res Mohali, Dept Phys Sci, Sect 81, Mohali 140306, Punjab, India

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

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

来源：

PHYSICAL REVIEW D | 2018年 / 98卷 / 12期

基金：

欧洲研究理事会; 中国国家自然科学基金;

关键词：

MODEL; UNIVERSE; PLANCK; I;

D O I：

10.1103/PhysRevD.98.123527

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In almost all interacting dark energy models present in the literature, the stability of the model becomes potentially sensitive to the dark energy equation-of-state parameter w(x), and a singularity arises at w(x) = -1. Thus, it becomes mandatory to test the stability of the model into two separate regions, namely, for quintessence and phantom. This essentially brings a discontinuity into the parameter space for w(x). Such discontinuity can be removed with some specific choices of the interaction or coupling function. In the present work, we choose one particular coupling between dark matter and dark energy that can successfully remove such instability, and we allow a dynamical dark energy equation-of-state parameter instead of the constant one. In particular, considering a dynamical dark energy equation of state with only one free parameter w(0), representing the current value of the dark energy equation of state, we confront the interacting scenario with several observational data sets. The results show that the present cosmological data allow an interaction in the dark sector, in agreement with some latest claims by several authors, and additionally, a phantom behavior in the dark energy equation of state is suggested at present. Moreover, for this case, the tension on H-0 is clearly released. In a final remark, we mention that, according to the Bayesian analysis, Lambda cold dark matter (Lambda CDM) is always favored over this interacting dark energy model.

引用

页数：15

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