The field of my research interest is on the intersection between particle physics and cosmology. During my PhD at the Institute for Theoretical Physics in Göttingen, I mostly worked on refined quantum statistical descriptions of the dark matter thermal production and decoupling mechanisms in the early Universe. As a postdoc at IPMU, I plan to continue working on theoretical and phenomenological aspects of quantum fields under extreme conditions in the early Universe, on predictions for dark matter detection at current and future experiments, as well as on finding new ideas about how to falsify the collisionless dark matter paradigm through astrophysical or cosmological observation.