论文标题
从地平线探测保姆
Probing de Sitter from the horizon
论文作者
论文摘要
在保姆背景的QFT中，可以研究将观察者的未来和过去视野之间的相关器研究。这是观察者因果钻石（称为静态斑块）中物理学的整洁探测。我们可以使用这种可观察到的在相互作用的理论中对准光谱进行概括，并将其连接到DS相关器的Källén-Lehmann扩展中出现的光谱密度。我们还引入了一个有限温度的有效场理论，该田间理论由耦合到边界的游离散装场组成。在将其与相关器的低频膨胀相匹配时，我们发现了来自单位性的EFT参数的阳性限制。
In a QFT on de Sitter background, one can study correlators between fields pushed to the future and past horizons of a comoving observer. This is a neat probe of the physics in the observer's causal diamond (known as the static patch). We use this observable to give a generalization of the quasinormal spectrum in interacting theories, and to connect it to the spectral density that appears in the Källén-Lehmann expansion of dS correlators. We also introduce a finite-temperature effective field theory consisting of free bulk fields coupled to a boundary. In matching it to the low frequency expansion of correlators, we find positivity constraints on the EFT parameters following from unitarity.
