Speaker
Kenichi Saikawa
(Kanazawa University)
Description
In the kinetic misalignment scenario for QCD axion dark matter, the axion carries significant kinetic energy in the early universe, which affects its dynamics at the epoch of the QCD phase transition and can lead to a significant amplification of primordial fluctuations due to the nonlinearities of the QCD potential. In this work, we present novel lattice simulations of the axion field to explore the nonlinear dynamics of kinetic misalignment scenario and discuss the impact of initial conditions on the relic density and dark matter distribution. Extracting the energy density power spectra, we study the main characteristics of axion miniclusters, drawing a coherent picture of the relic abundance and dark matter substructure.
Authors
Cem Eröncel
(İstinye University)
Javier Redondo
(University of Zaragoza)
Kenichi Saikawa
(Kanazawa University)
Kierthika Chathirathas
(Karlsruhe Institute of Technology)
Mathieu Kaltschmidt
(University of Zaragoza)