Suro Kim (KIAS)

10:30am Tuesday Dec 17, 2024
Geoff Opat Seminar Room

Phenomenological applications of positivity bounds

Positivity bounds are UV-IR consistency conditions derived from fundamental principles like unitarity and causality, and they provide valuable constraints on phenomenological models. In this talk, we’ll first explore the application of positivity bounds within the cosmological collider program. In the standard cosmological collider framework, signals from heavy particles with mass greater than the Hubble scale are exponentially suppressed. We propose a complementary approach to read off the spin of heavy particles using positivity bounds. Then, we will discuss how positivity bounds can be applied to dark matter models, specifically focusing on millicharged dark matter and constraining their parameter space.