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【Abstract】

Previous works have revealed that non-Gaussianities of inflationary perturbations encode the mass of isocurvature particles, which approach to physics beyond the Standard Model is dubbed as the cosmological collider. However, particles are characterized by more than just mass; their spins, charges, and interactions also play a crucial role. In this talk, I will discuss several aspects of identifying interactions from cosmological collider signals. My discussion is based on two papers: the first, 2312.09642, addresses the scale dependence induced by non-shift-symmetric interactions, and the second, 2404.09547, presents an exact calculation of a diagram involving double massive intermediate particles.