Nonzero constant curvature pp-wave metrics are almost universal, reducing generic gravity field equations to cosmological Einstein-Maxwell theory with null dust on the background topology R^{1,1} × S².
From smooth curves to universal metrics,
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New Almost Universal Metrics
Nonzero constant curvature pp-wave metrics are almost universal, reducing generic gravity field equations to cosmological Einstein-Maxwell theory with null dust on the background topology R^{1,1} × S².