Axion String Dynamics I: 2+1D

Abstract

If the axion exists and if the initial axion field value is uncorrelated at causally disconnected points, then it should be possible to predict the efficiency of cosmological axion production, relating the axionic dark matter density to the axion mass. The main obstacle to making this prediction is correctly treating the axion string cores. We develop a new algorithm for treating the axionic string cores correctly in 2+1 dimensions. When the axionic string cores are given their full physical string tension, axion production is about twice as efficient as in previous simulations. We argue that the string network in 2+1 dimensions should behave very differently than in 3+1 dimensions, so this result cannot be simply carried over to the physical case. We outline how to extend our method to 3+1D axion string dynamics.

22 pages plus two appendices; 15 figures. Version 2 adds minor clarifications and catches a few typos, no substantive changes. Published version

References in corpus (4)

• The QCD axion, precisely
• Improved estimation of radiated axions from cosmological axionic strings
• Cosmic string loops in the expanding universe
• Forward di-jet production in p+Pb collisions in the small-x improved TMD factorization framework

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