Basso, EdwardChung, Daniel J.H.Kolb, Edward W.Long, Andrew J.2023-01-272023-01-272022Basso, Edward, Chung, Daniel J.H., Kolb, Edward W., et al.. "Quantum interference in gravitational particle production." <i>Journal of High Energy Physics,</i> 2022, (2022) Springer Nature: https://doi.org/10.1007/JHEP12(2022)108.https://hdl.handle.net/1911/114263Previous numerical investigations of gravitational particle production during the coherent oscillation period of inflation displayed unexplained fluctuations in the spectral density of the produced particles. We argue that these features are due to the quantum interference of the coherent scattering reactions that produce the particles. We provide accurate analytic formulae to compute the particle production amplitude for a conformally- coupled scalar field, including the interference effect in the kinematic region where the production can be interpreted as inflaton scattering into scalar final states via graviton exchange.engThis article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.Journal articleJHEP12-2022-108https://doi.org/10.1007/JHEP12(2022)108