广义QCD鬼暗能量的不稳定性声音
Sounds of instability from generalized QCD ghost dark energy
摘要：
研究了广义QCD鬼暗能量模型在FRW背景扰动下的稳定性。为此，我们使用平方声速$v_s^2$，其符号决定了模型的稳定性。我们探讨了该模型的稳定性，在存在/不存在之间的相互作用的暗能量和暗物质在平坦和非平坦的几何形状。在所有情况下，我们发现几乎相同的结果。基于平方声速分析，由于该模型中自由参数的存在，理论上该模型能够导出一个暗能量主导的稳定宇宙。然而，观测限制排除了这种可能性。总之，我们发现了广义鬼暗能量可能无法导致目前观测所青睐的稳定宇宙的证据。
英文摘要：
We investigate about the stability of generalized QCD ghost dark energy model against perturbations in the FRW background. For this purpose, we use the squared sound speed $v_s^2$ whose sign determines the stability of the model. We explore the stability of this model in the presence/absence of interaction between dark energy and dark matter in both flat and non-flat geometry. In all cases we find almost a same result. Based on the square sound speed analysis, due to the existence of a free parameter in this model, the model is theoretically capable to lead a dark energy dominated stable universe. However, observational constraints rule out such a chance. In conclusion, we find evidences that the generalized ghost dark energy might can not lead to a stable universe favored by observations at the present time.
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。
