具有粘滞性新Agegraphic Chaplygin气体的重构

发布时间：2018-07-05 09:50

本文选题：粘滞效应 + 暗能量　；参考：《辽宁师范大学》2014年硕士论文

【摘要】：最近几年的天文观测表明当前的宇宙不仅正在膨胀,而且正经历加速膨胀。解释何为驱动宇宙加速膨胀的源动力,已经成为当今宇宙学的热点问题。人们已提出很多理论,其中认为最好的候选者是作为暗能量模型的宇宙学常数,即所谓的真空能。目前已建立多种暗能量模型,但都有着各自的优缺点。本文深入研究了粘滞效应对新Agegraphic暗能量(NADE)模型与修正的Chaplygin气体(MCG)模型重构的影响。首先研究了在粘滞效应影响下,存在三种不同相互作用时新Agegraphic暗能量态参数方程ωq的演化规律。研究结果表明,当相互作用项取为Q1=3Hb2ρq和Q2=3Hb2ρdm时,实现了态参数ω对Phantom边界的穿越,粘滞效应将推迟Phantom边界的穿越,并且v值越大,将越推迟穿越。其次,本文讨论了在非平直宇宙中有相互作用的MCG模型,其中暗能量组分为新Agegraphic暗能量的情况。我们分别重构了三种不同相互作用下的势能V(φ)和标量场φ(a),并分别对不同相互作用强度下的演化规律进行了研究。最后,在上述基础上,我们考虑了粘滞性带来的影响。具体地,给出了其不同相互作用下的势能V(φ)和标量场φ(a)的重构结果,并对粘滞性给它们的演化规律带来的影响进行了分析。
[Abstract]:Astronomical observations in recent years have shown that the current universe is not only expanding, but is experiencing accelerated expansion. Explaining what drives the accelerating expansion of the universe has become a hot topic in cosmology. Many theories have been put forward, among which the best candidate is the cosmological constant, the so-called vacuum energy, which is regarded as the dark energy model. A variety of dark energy models have been established, but each has its own advantages and disadvantages. The effects of viscosity on the reconstruction of the new Agegraphic dark energy (nade) model and the modified Chaplygin gas (MCG) model are studied. In this paper, we first study the evolution of the new Agegraphic dark energy parameter equation 蠅 Q under the influence of viscous effect. The results show that when the interaction terms are Q _ (1) H _ (3) H _ (2) 蟻 _ Q and Q _ (2) H _ (3) H _ (2) 蟻 _ (DM), the crossing of the Phantom boundary is realized by the state parameter 蠅, and the viscosity effect will delay the crossing of the Phantom boundary, and the greater the v value, the longer the crossing. Secondly, in this paper, we discuss the model of MCG with interaction in a non-planar universe, where the dark energy component is a new Agegraphic dark energy. We reconstruct the potential energy V (蠁) and scalar field 蠁 (a), of three different interactions, and study the evolution of the potential energy V (蠁) and the scalar field 蠁 (a), respectively. Finally, on the basis of the above, we consider the effect of viscosity. In detail, the reconstruction results of potential energy V (蠁) and scalar field 蠁 (a) under different interactions are given, and the influence of viscosity on their evolution is analyzed.
【学位授予单位】：辽宁师范大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P159

【共引文献】