Abstract
We show that the evolution of interacting massive particles in the de Sitter bulk can be understood at leading order as a series of resonant decay and production events. From this perspective, we classify the cosmological collider signals into local and nonlocal categories with drastically different physical origins. This further allows us to derive a cutting rule for efficiently extracting these cosmological collider signals in an analytical fashion. Our cutting rule is a practical way for extracting cosmological collider signals in model building, and can be readily implemented as symbolic computational packages in the future.
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Tong, X., Wang, Y. & Zhu, Y. Cutting rule for cosmological collider signals: a bulk evolution perspective. J. High Energ. Phys. 2022, 181 (2022). https://doi.org/10.1007/JHEP03(2022)181
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DOI: https://doi.org/10.1007/JHEP03(2022)181