Shell-to-shell transfer analysis in decaying MHD turbulence demonstrates direct non-local inverse energy transfer from the integral scale, resulting in multiplicative growth of large-scale magnetic energy, confined within helical sectors when net helicity is zero.
CMB spectral distortions from the decay of causally generated magnetic fields
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abstract
We improve previous calculations of the CMB spectral distortions due to the decay of primordial magnetic fields. We focus our studies on causally generated magnetic fields at the electroweak and QCD phase transitions. We also consider the decay of helical magnetic fields. We show that the decay of non-helical magnetic fields generated at either the electroweak or QCD scale produce $\mu$ and $y$-type distortions below $10^{-8}$ which are probably not detectable by a future PIXIE-like experiment. We show that magnetic fields generated at the electroweak scale must have a helicity fraction $f_*>10^{-4}$ in order to produce detectable $\mu$-type distortions. Hence a positive detection coming from the decay of magnetic fields would rule out non-helical primordial magnetic fields and provide a lower bound on the magnetic helicity.
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Inverse energy transfer in decaying MHD turbulence: A shell-to-shell analysis
Shell-to-shell transfer analysis in decaying MHD turbulence demonstrates direct non-local inverse energy transfer from the integral scale, resulting in multiplicative growth of large-scale magnetic energy, confined within helical sectors when net helicity is zero.