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An answer is a phase-sensitive or scattering detection of $\\Delta_Q$ with its correlation length, or a bound that excludes it.","problem_ref":null,"references":"","settled_by":"A bulk probe (x-ray or neutron scattering, or c-axis Josephson coupling in La2-xBaxCuO4) showing long-range $\\Delta_Q$ order with a correlation length exceeding that of the coexisting charge order.","status_note":"Scanned Josephson tunneling found a $4a0$ pair-density modulation in Bi2Sr2CaCu2O8+x at zero field (2016) and field-induced $8a0$ modulations near vortex cores (2019); whether a primary long-range pair density wave exists in the bulk is not established.","title":"Is there a bulk pair density wave in any 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