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Cosmic Birefringence and Axiogenesis
Recent analyses of Planck and ACT CMB data report a $2\text{-}4σ$ hint of isotropic cosmic birefringence ($β\approx 0.3^\circ$), corresponding to a parity-violating rotation of polarization planes that points to potential new physics. We show that both the hint of cosmic birefringence and the observ
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