A cosmic string solution to the radio synchrotron background

2023/08/07 by Bryce Cyr, Jens Chluba, Cyr, Bryce +3 · 1 citation
Physics and Astronomy · Engineering · #Radio Astronomy Observations and Technology #Astrophysics and Cosmic Phenomena #Particle Accelerators and Free-Electron Lasers

paper · pdf · doi:10.48550/arxiv.2308.03512

Abstract

We investigate the low-frequency spectral emission from a network of superconducting cosmic string loops in hopes of explaining the observed radio synchrotron background. After considering constraints from a variety of astrophysical and cosmological measurements, we identify a best-fit solution with string tension Gμ≃ 6.5 × 10^-12 and current I ≃ 2.5 × 10⁶ GeV. This model yields a convincing fit to the data and may be testable in the near future by spectral distortion (TMS, BISOU) and 21 cm experiments (HERA, SKA, REACH). We also find that soft photon heating protects us against current constraints from global 21 cm experiments.

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