[JC] New Source for QCD Axion Dark Matter Production: Curvature Induced

by Taehyun Jung

Thursday 5 Mar 2026, 15:00 → 16:00 Asia/Seoul

CTPU seminar room (IBS)

In this talk, I will introduce 2503.04880 (recently published in PRL), where the authors estimated axion fluctuation induced by curvature perturbation in the scenario of the "kinetic" misalignment mechanism. The energy density of the fluctuation can be the dominant DM component in some parameter region. I forward the authors and abstract of the paper below.

 

Authors:  Cem Eroncel, Yann Gouttenoire, Ryosuke Sato, Geraldine Servant, and Peera Simakachorn

 

Abstract of the paper: We discuss a novel mechanism for generating dark matter from a fast-rolling scalar field, relevant for both inflation and rotating axion models, and apply it specifically to the (QCD) axion. Dark matter comes from scalar field fluctuations generated by the product of the curvature perturbation and the fast-rolling background field. These fluctuations can explain the totality of dark matter in a vast axion parameter space, particularly for the QCD axion, which will be targeted by upcoming experiments. We review the constraints on this mechanism and potential gravitational-wave signatures.