Superconducting cosmic string loops emit vector radiation whose strength is fitted in this paper; including this channel suppresses the predicted gravitational wave background for strong coupling and can make the spectrum compatible with NANOGrav for large currents.
Constraints on Superconducting Cosmic Strings from the Global $21$-cm Signal before Reionization
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abstract
Electromagnetic radiation from the cusp region of superconducting cosmic strings leads to a radio excess in the photon spectrum in the early universe and can produce a deep absorption feature in the global 21cm signal before the epoch of reionization. We study the constraints on the parameter space of superconducting strings which can be derived by demanding that the absorption feature is not larger in amplitude than what has recently been reported by the EDGES collaboration.
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Stochastic Gravitational Wave Background from Chiral Superconducting Cosmic Strings
Superconducting cosmic string loops emit vector radiation whose strength is fitted in this paper; including this channel suppresses the predicted gravitational wave background for strong coupling and can make the spectrum compatible with NANOGrav for large currents.