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Cosmological parity violationa living review

Whether the universe distinguishes left from right: chiral gravitational waves, cosmic birefringence and parity-odd correlations of galaxies, and how theory, simulation and observation test them.

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Four tracers define three separation vectors. Drag to rotate: the sign of r₁ · (r₂ × r₃) never changes. Only a reflection flips it, passing through a flat configuration. The parity-odd four-point function measures the excess of one handedness over the other; blue faces mark right-handed, red left-handed.

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