幂律势中的五子演化
Quintom evolution in power-law potentials
摘要：
研究了幂律势中的五重态演化。在物质主导的假设下，我们提取了早期的追踪器解决方案。此外，我们得到的解析解在中间的时间，即在低红移，这是在过渡期间从物质到暗能量的统治。与精确进化的比较表明，跟踪器的解决方案是有效的，在98%以内的z>1.5，而中间的是准确的，在98%以内的z=0.5。使用这些表达式，我们提取了两个新的W-参数化，一个在红移和暗能量密度参数方面，我们提出了各种五分演化子类，包括五分像或幻影的情况下，实现的-1-交叉，和非单调W-演化。
英文摘要：
We investigate quintom evolution in power-law potentials. We extract the early-time, tracker solutions, under the assumption of matter domination. Additionally, we derive analytical solutions at intermediate times, that is at low redshifts, which is the period during the transition from matter to dark-energy domination. A comparison with exact evolution reveals that the tracker solutions are valid within 98% for z>1.5, while the intermediate ones are accurate within 98% up to z=0.5. Using these expressions we extract two new w-parametrizations, one in terms of the redshift and one in terms of the dark-energy density-parameter, and we present various quintom evolution sub-classes, including quintessence-like or phantom-like cases, realization of the -1-crossing, and non-monotonic w-evolution.
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