Cosmic Crystal: How Vacuum Defects Twist Light ✦

Original: "CMB Birefringence from Vacuum Interfaces"

arXiv:2605.11065v1 · 2026-05-11 · CC BY · ⏱ 1 min · HEP Theory Cosmology General Relativity HEP Phenomenology Quantum Physics

A new mechanism: the polarization rotation of the CMB arises from photons crossing domain walls of the dark sector—no axions needed.

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13.8 billion years of wandering—and a CMB photon could have pierced invisible vacuum partitions, domain walls, repeatedly picking up a microscopic polarization twist, like a glint in the facets of a cosmic crystal. Today astronomers have measured this cumulative tilt in thousandths of a radian. The network of vacuum cracks is no longer a hypothesis but a probable architecture of the universe. We're one step away from feeling the very body of deep space.

🎯 Amazingly, the key to the cosmological signal was found back in 1956 by Indian physicist Pancharatnam: the geometric phase he discovered for light in ordinary media now emerges at the boundaries of the dark sector. And even if the domain walls themselves vanished long ago, their polarization shadow will forever wander in the CMB.

\Delta\vartheta = \frac{\zeta q}{6}

Rotation of the linear polarization plane upon crossing an interface, expressed via the effective coupling constant ζ and the membrane charge q.

\zeta(k) \simeq \frac{\zeta(0)}{1 + k^2/M^2}

Suppression of the interaction at photon momenta k exceeding the cutoff scale M, due to integrating out heavy degrees of freedom.

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Cosmic Crystal: How Vacuum Defects Twist Light ✦