Speaker
Peizhi Du
(University of Science and Technology of China)
Description
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 discuss how isocurvature can induce gravitational waves at second order in perturbation theory. Moreover, Pulsar Timing Arrays can set stringent limits on isocurvature around $10^6\textrm{Mpc}^{-1}$ via isocurvature-induced gravitational waves.
Authors
Yi-Fu Cai
(University of Science and Technology of China)
Peizhi Du
(University of Science and Technology of China)
Jiahang Zhong
(University of Science and Technology of China)