General Constraints on Primordial Isocurvature from the Cosmic Microwave Background and Pulsar Timing Arrays

by Prof. Peizhi Du（杜佩之） (University of Science and Technology of China)

Thursday 12 Mar 2026, 11:00 → 12:00 Asia/Shanghai

Tsung-Dao Lee Institute/N6F-N600 - Lecture Room (Tsung-Dao Lee Institute)

Abstract: 

The standard cosmological model (ΛCDM model) assumes adiabatic initial conditions for primordial density perturbations. However, many new physics scenarios can deviate from this assumption and generate isocurvature perturbations across a wide range of scales. In this talk, I will present general constraints on large-scale isocurvature (between 10^-4 Mpc^-1 and 10^-1 Mpc^-1) from observation of the Cosmic Microwave Background. Moreover, Pulsar Timing Arrays set stringent limits on isocurvature around 10^6 Mpc^-1 via isocurvature induced gravitational waves.

Biography: 

Peizhi Du is currently a tenure-track professor at the University of Science and Technology of China. He earned his bachelor's degree from Nanjing University, and his PhD from the University of Maryland. He was a postdoctoral associate at Stony Brook University and Rutgers University. His research focuses on particle physics phenomenology, including direct detection of light dark matter as well as astrophysical and cosmological probes of physics beyond the Standard Model. 

Online Meeting Room：https://meeting.tencent.com/dm/xQWohz5WNEZv

ID：390131531