Inflationary QCD Phase Diagram
Speaker
Date
Time
Place
Room 7S1 (Cosmology Hall)
Abstract
We discuss a possibility to utilize inflation for probing phase structures of the particle physics model at the inflation scale. As a benchmark example to explore this possibility, we consider QCD-like theories with an axial chemical potential induced by a rolling inflaton and draw the phase diagram during inflation, identifying the Hubble parameter as the temperature and the inflaton velocity as the chemical potential. We clarify the first-order critical line and its endpoint by employing an effective description of chiral symmetry breaking within the framework of the Nambu–Jona-Lasinio model. Some phenomenological implications are also discussed.
Biography
Toshifumi Noumi is a cosmologist and theoretical physicist specializing in particle physics, cosmology, and string theory. He earned his PhD from the University of Tokyo and was then a postdoc at RIKEN and Hong Kong University. He was a Professor at Kobe University, before joining Tokyo’s Graduate School of Arts and Sciences as an Associate Professor. Noumi's research focuses on areas such as the swampland, cosmic inflation and effective field theory.