论文标题
创世纪宇宙学中的扰动单位性和NEC违反
Perturbative unitarity and NEC violation in genesis cosmology
论文作者
论文摘要
探索侵犯无效状况（NEC）在宇宙学中的探索可以丰富我们对早期宇宙和相关重力理论的理解。尽管可以在``超越Horndeski''理论中实现完全稳定的NEC违规行为，但仍然是一个悬而未决的问题，这仍然是一个违反NEC的问题，是否允许使用紫外线完整理论的某些基本属性或有效现场理论（EFT）的一致性要求。我们研究了在加里昂和``超越霍恩德斯基''Genesis宇宙学的稳定NEC违规的树级扰动单位性，在过去，宇宙在过去渐近Minkowskian。我们发现，扰动单位性的约束意味着我们可能需要一些未知的新物理，而不是``超越霍恩德斯基''operator'''EFT的截止量表。
Explorations of the violation of null energy condition (NEC) in cosmology could enrich our understanding of the very early universe and the related gravity theories. Although a fully stable NEC violation can be realized in the ``beyond Horndeski'' theory, it remains an open question whether a violation of the NEC is allowed by some fundamental properties of UV-complete theories or the consistency requirements of effective field theory (EFT). We investigate the tree-level perturbative unitarity for stable NEC violations in the contexts of both Galileon and ``beyond Horndeski'' genesis cosmology, in which the universe is asymptotically Minkowskian in the past. We find that the constraints of perturbative unitarity imply that we may need some unknown new physics below the cut-off scale of the EFT other than that represented by the ``beyond Horndeski'' operators.
