A model-independent null-test quantity E_P is defined from galaxy multi-tracing cross-correlations including relativistic corrections and forecasted to be measurable at 7-15% precision by SKA for z<0.6.
The Pantheon+ Analysis: Cosmological Constraints,
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Testing the equivalence principle across the Universe: a model-independent approach with galaxy multi-tracing
A model-independent null-test quantity E_P is defined from galaxy multi-tracing cross-correlations including relativistic corrections and forecasted to be measurable at 7-15% precision by SKA for z<0.6.