Running coupling: does the coupling between dark energy and dark matter change sign during the cosmological evolution?
Running coupling: does the coupling between dark energy and dark matter change sign during the cosmological evolution?
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运行耦合:暗能量和暗物质之间的耦合在宇宙演化过程中是否会改变符号?
DOI:
10.1140/epjc/s10052-011-1700-8
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发表时间:
2011-03
影响因子:
4.4
通讯作者:
Xin Zhang
中科院分区:
文献类型:
--
作者:
Yun-He Li;Xin Zhang
In this paper we put forward a running coupling scenario for describing the interaction between dark energy and dark matter. The dark sector interaction in our scenario is free of the assumption that the interaction termQis proportional to the Hubble expansion rate and the energy densities of dark sectors. We only use a time-variable couplingb(a) (withathe scale factor of the universe) to characterize the interactionQ. We propose a parametrization form for the running couplingb(a)=b0a+be(1−a) in which the early-time coupling is given by a constantbe, while today the coupling is given by another constant,b0. For investigating the feature of the running coupling, we employ three dark energy models, namely, the cosmological constant model (w=−1), the constantwmodel (w=w0), and the time-dependentwmodel (w(a)=w0+w1(1−a)). We constrain the models with the current observational data, including the type Ia supernova, the baryon acoustic oscillation, the cosmic microwave background, the Hubble expansion rate, and the X-ray gas mass fraction data. The fitting results indicate that a time-varying vacuum scenario is favored, in which the couplingb(z) crosses the noninteracting line (b=0) during the cosmological evolution and the sign changes from negative to positive. The crossing of the noninteracting line happens at aroundz=0.2–0.3, and the crossing behavior is favored at about 1σconfidence level. Our work implies that we should pay more attention to the time-varying vacuum model and seriously consider the phenomenological construction of a sign-changeable or oscillatory interaction between dark sectors.
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