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arXiv 1012.2692gr-qc
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非平坦宇宙中相互作用多方气体暗能量模型的宇宙学意义

Cosmological implications of interacting polytropic gas dark energy model in non-flat universe

M. Malekjani, A. Khodam-Mohammadi, M. Taji

摘要:

多方气体模型作为一个相互作用的暗能量方案进行了研究。研究了EoS参数$w_Λ$、能量密度$Ω_Λ$和减速参数$q$的演化.我们发现,依赖于模型参数,相互作用多方气体可以表现为一种典型的或虚幻的暗能量。在该模型中,体模分界线从下向上穿过。在多方气体暗能量模型中,$q$的演化表现为早期的减速阶段和后期的加速阶段。讨论了该模型的奇异性。最后,我们建立了具有快子、K-本质和介子标量场的相互作用多方气体模型之间的对应关系。这些标量场模型的势和动力学根据相互作用多方气体的演化重建。

英文摘要:

The polytropic gas model is investigated as an interacting dark energy scenario. The cosmological implications of the model including the evolution of EoS parameter $w_Λ$, energy density $Ω_Λ$ and deceleration parameter $q$ are investigated. We show that, depending on the parameter of model, the interacting polytropic gas can behave as a quintessence or phantom dark energy. In this model, the phantom divide is crossed from below to up. The evolution of $q$ in the context of polytropic gas dark energy model represents the decelerated phase at the early time and accelerated phase later. The singularity of this model is also discussed. Eventually, we establish the correspondence between interacting polytropic gas model with tachyon, K-essence and dilaton scalar fields. The potential and the dynamics of these scalar field models are reconstructed according to the evolution of interacting polytropic gas.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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