[NTU String Seminar] Cosmological Collider as an Interaction Probe: Scale-dependence and Diagrams

• Event Date: 2026-06-08
• Chen, Jhan Yu 陳詹喻
• High Energy Physics and Astrophysics High energy theory
• Speaker: Fumiya Sano (Tokyo U.)  /  Host: Prof. Pei-Ming Ho
  Place: Rm. 815, Dept. of Physics, NTU

Title: [NTU String Seminar] Cosmological Collider as an Interaction Probe: Scale-dependence and Diagrams
Speaker: Fumiya Sano (Tokyo U.)
Time: 2026/6/8 (Mon.) 14:00
Place: Rm. 815, Dept. of Physics, NTU
 

Abstract

Primordial non-Gaussianities provide a natural probe of high-energy physics during inflation. Cosmological collider signals, in particular, can encode the presence of massive particles through characteristic momentum-space signatures, making them a possible window into physics beyond the Standard Model. While this program has initially emphasized mass and spin spectroscopy, recent progress in amplitude and bootstrap methods has made it possible to compute and analyze cosmological correlators with increasing precision. Motivated by this development, I will discuss how cosmological collider signals can also probe interaction structures. I will present two examples: scale-dependent signals induced by non-shift-symmetric inflaton couplings, and exact results for correlators with double massive exchange. These examples illustrate how primordial correlators may contain information not only about the spectrum of particles during inflation, but also about the interactions that generated them.