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arXiv 0706.3467gr-qcastro-phhep-th
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圈量子宇宙学中的耦合幻影场

Coupled phantom field in loop quantum cosmology

Burin Gumjudpai

摘要:

研究了圈量子宇宙学中指数势耦合下的虚标量场暗能量与正压暗物质流体的模型。在这种情况下,我们推导出一个封闭的宇宙动力学自治系统。圈量子宇宙中的膨胀即使在虚场存在的情况下也有反弹。从暗物质到暗幻影能量的更大衰减导致在幻影场中存储更大的能量。这导致了该领域的进一步转折点。更大的耦合也会延迟反弹时间。在幻象衰减的情况下,幻象密度的振荡使得物质密度的增加产生微小的振荡。

英文摘要:

A model of phantom scalar field dark energy under exponential potential coupling to barotropic dark matter fluid in loop quantum cosmology is addressed here. We derive a closed-autonomous system for cosmological dynamics in this scenario. The expansion in loop quantum universe has a bounce even in presence of the phantom field. The greater decaying from dark matter to dark phantom energy results in greater energy storing in the phantom field. This results in further turning point of the field. Greater coupling also delays bouncing time. In the case of phantom decaying, oscillation in phantom density makes small oscillation in the increasing matter density.

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