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Explore cutting-edge research on Galactic magnetic fields and their impact on CMB foreground polarization in this astrophysics seminar presentation. Delve into new methodologies for modeling Galactic foregrounds and magnetic fields through the lens of MHD turbulence and nonlinear spectroscopic mapping effects. Learn about innovative approaches including velocity gradient technique and machine learning frameworks that utilize 21 cm neutral hydrogen emission to determine the three-dimensional orientation and strength of Galactic magnetic fields. Discover how the Galactic rotation curve enables full 3D spatial distribution reconstruction of these magnetic fields, and examine their correlation with stellar polarization data and Planck 353 GHz polarization observations. Understand the significance of these techniques in addressing B-mode polarization contamination from Galactic dust and synchrotron foreground polarization, which affects the detection of inflationary gravitational wave signals in CMB observations.
