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arXiv 0910.4891gr-qcastro-ph.CO
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圈量子宇宙学中的Quintessence和(反)Chaubergin气体

Quintessence and (Anti-)Chaplygin Gas in Loop Quantum Cosmology

Raphael Lamon, Andreas Woehr

摘要:

宇宙学的和谐模型包含了几个未知的成分,如暗物质和暗能量。人们提出了许多建议,通过为标量场选择适当的势来描述它们。我们研究了圈量子宇宙学(LQC)领域中的四种模型:Chaubergin气体,暴胀和辐射状的潜力,精华和反Chaubergin气体。对于后者,我们表明,所有的轨迹开始和结束的II型奇点,并根据初始值,可能会通过反弹。另一方面,在前三个标量场的影响下,演化行为在远离大爆炸奇点的时候是经典的,并且当能量密度接近临界密度时会反弹。

英文摘要:

The concordance model of cosmology contains several unknown components such as dark matter and dark energy. Many proposals have been made to describe them by choosing an appropriate potential for a scalar field. We study four models in the realm of loop quantum cosmology (LQC): the Chaplygin gas, an inflationary and radiation-like potential, quintessence and an anti-Chaplygin gas. For the latter we show that all trajectories start and end with a type II singularity and, depending on the inital value, may go through a bounce. On the other hand the evolution under the influence of the first three scalar fields behaves classically at times far away from the big bang singularity and bounces as the energy density approaches the critical density.

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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