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Dust-polarization maps for local interstellar turbulence
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We show that simulations of magnetohydrodynamic turbulence in the multiphase interstellar medium yield an $E/B$ ratio for polarized emission from Galactic dust in broad agreement with recent $Planck$ measurements. In addition, the $B$-mode spectra display a scale dependence that is consistent with observations over the range of scales resolved in the simulations. The simulations present an opportunity to understand the physical origin of the $E/B$ ratio, and a starting point for more refined models of Galactic emission of use for both current and future CMB experiments.
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The Shocking Origin of the Flat $EE/BB$ Ratio
MHD shocks flatten the EE/BB ratio of polarized ISM emission to values ≳1 as energy injection increases, accompanied by a -7/2 power-law tail in velocity divergence.
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