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Scaling density of axion strings
(APS, 2020-01-16)
In the QCD axion dark matter scenario with postinflationary Peccei-Quinn symmetry breaking, the number density of axions, and hence the dark matter density, depends on the length of string per unit volume at cosmic time ...
Approach to scaling in axion string networks
(APS, 2021-05-26)
We study the approach to scaling in axion string networks in the radiation era, through measuring the root-mean-square velocity v as well as the scaled mean string separation x. We find good evidence for a fixed point in ...
Nambu-Goto Dynamics of Field Theory Cosmic String Loops
(IOP Publishing, 2023-05-18)
We perform a detailed comparison of the dynamics of cosmic string loops obtained in cosmological field theory simulations with their expected motion according to the Nambu-Goto action. We demonstrate that these loops follow ...