论文标题
有效的现场理论描述早期宇宙宇宙学的描述
Unitarity Problems for an Effective Field Theory Description of Early Universe Cosmology
论文作者
论文摘要
在有效的现场理论的背景下，国家的希尔伯特空间在不断扩展的宇宙中增加。因此，时间演变不能统一。通常使用有效的现场理论技术研究结构的形成。我们研究了对早期宇宙模型的有效现场理论分析的限制，这些模型是由于要求与原始波动相对应的状态空间的因素，而原始波动显然不会遭受单位性问题的影响。对于弹跳和新兴的宇宙学，只要反弹或紧急阶段的能量尺度小于紫外线（UV）截止量表，就不会出现任何约束。另一方面，在通货膨胀情况下，出现了通货膨胀能量尺度上的非平凡的上限。
In the context of Effective Field Theory, the Hilbert space of states increases in an expanding universe. Hence, the time evolution cannot be unitary. The formation of structure is usually studied using effective field theory techniques. We study the constraints on effective field theory analyses of early universe models which come from demanding that the factor of the space of states corresponding to length scales where the primordial fluctuations are manifest does not suffer from the unitarity problem. For bouncing and emergent cosmologies, no constraints arise provided that the energy scale of the bounce or emergent phases is smaller than the ultraviolet (UV) cutoff scale. On the other hand, in the case of the inflationary scenario, non-trivial upper bounds on the energy scale of inflation arise.
