第一千零六十三章新的爆火幽灵
The New Ekpyrotic Ghost
摘要：
新的ekpyrotic方案试图解决奇异性问题，涉及违反零能量条件的模型相结合的ekpyrotic/循环的情况下，鬼凝聚理论和曲率机制的生产绝热微扰的度量。这个理论的拉格朗日量，以及幽灵凝聚模型的拉格朗日量，包含一个具有更高导数的项，它被添加到理论中以稳定其真空状态。我们发现这项可能会影响宇宙学演化的动力学。此外，在适当的量子化后，这一项将导致一个新的具有负能量的鬼场的存在，这将导致灾难性的真空不稳定性。我们解释了为什么不能把这个危险的长期作为一个有效的修正，只有在小的能量和动量低于一些UV截止，并证明了所产生的问题，当人们试图构建一个UV完成这个理论。
英文摘要：
The new ekpyrotic scenario attempts to solve the singularity problem by involving violation of the null energy condition in a model which combines the ekpyrotic/cyclic scenario with the ghost condensate theory and the curvaton mechanism of production of adiabatic perturbations of metric. The Lagrangian of this theory, as well as of the ghost condensate model, contains a term with higher derivatives, which was added to the theory to stabilize its vacuum state. We found that this term may affect the dynamics of the cosmological evolution. Moreover, after a proper quantization, this term results in the existence of a new ghost field with negative energy, which leads to a catastrophic vacuum instability. We explain why one cannot treat this dangerous term as a correction valid only at small energies and momenta below some UV cut-off, and demonstrate the problems arising when one attempts to construct a UV completion of this theory.
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。
