论文标题
能源条件允许永恒的通货膨胀
Energy conditions allow eternal inflation
论文作者
论文摘要
永恒的通货膨胀需要哈勃体积的能量向上波动，这似乎违反了能量条件。特别是，膨胀时空中的标量场应遵守平均的无效能量条件，这似乎排除了永恒的膨胀。在这里，我们展示了当遵守能量条件（甚至无效的能量条件）时，永恒的通货膨胀如何。关键点是能量条件限制了任何单个量子状态的演变，而永恒膨胀的过程涉及反复选择先前状态的子部门，因此没有违反条件的单一状态。
Eternal inflation requires upward fluctuations of the energy in a Hubble volume, which appear to violate the energy conditions. In particular, a scalar field in an inflating spacetime should obey the averaged null energy condition, which seems to rule out eternal inflation. Here we show how eternal inflation is possible when energy conditions (even the null energy condition) are obeyed. The critical point is that energy conditions restrict the evolution of any single quantum state, while the process of eternal inflation involves repeatedly selecting a subsector of the previous state, so there is no single state where the conditions are violated.
