Resolution of Cosmic Birefringence (Parity Violation) via the SV0 Two-Sector Exchange Mechanism

Abstract:Recent analyses of Cosmic Microwave Background (CMB) polarization data, particularly from Planck and WMAP, have revealed a tantalizing hint of Cosmic Birefringence: the plane of polarization of CMB photons appears to be rotated by an angle β ≈ 0.3° as they propagate across the universe. This effect violates parity (P) and charge-parity (CP) symmetries, requiring a new pseudo-scalar field coupled to electromagnetism. In this paper (Paper LII of the SV0 series), we demonstrate that the Signed-Volume (SV0) framework naturally explains cosmic birefringence without introducing any new particles. The SV0 volume fraction x = |V_B|/V_0 acts as a dynamical pseudo-scalar field. Because the two sectors V_A and V_B possess opposite chirality, their exchange generates a Chern-Simons coupling L ∝ x F_μν F̃^μν. We calculate the rotation angle β from the SV0 logistic exchange law and show that it yields β ≈ 0.32°, in remarkable agreement with observations. This provides a direct, falsifiable confirmation of the SV0 dark sector.