Fluctuations and Radiation in Axion String Networks

by Heejoo Kim

Thursday 5 Mar 2026, 16:00 → 17:00 Australia/Sydney

We investigate the dynamics of global axion string networks formed after Peccei–Quinn symmetry breaking in the post-inflationary scenario. Using lattice field simulations, we confirm logarithmic scaling in the string number density as well as in the power-law index of the axion radiation spectrum. We also introduce the power-law index of the string fluctuation spectrum, which exhibits logarithmic growth and shows a close connection to the axion radiation spectrum. A statistical study of long-string configurations further indicates a strong link between string dynamics and the scaling properties of axion emission.