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Measuring that twist would point to their origin.","posed_since":"","precise":"Measure the magnetic helicity of void fields through parity-odd correlations in the arrival directions and energies of cascade $\\gamma$ rays (the $Q$ statistic of Tashiro and Vachaspati) or through Faraday rotation. CP-violating magnetogenesis (for example during baryogenesis) predicts maximal helicity of one sign. An answer is a detection with sign, or a bound on the helical fraction.","problem_ref":null,"references":"","settled_by":"Parity-odd statistics of diffuse GeV gamma rays from Fermi and future gamma-ray telescopes with controlled Galactic foregrounds.","status_note":"","title":"Do intergalactic magnetic fields carry net 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