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LSST will supply up to $10^6$ supernovae (SNe) to constrain dark energythrough the distance-redshift ($D_L$-$z$) test. Obtaining spectroscopic SNredshifts (spec-$z$s) is unfeasible; alternatives are suboptimal and may bebiased. We propose a powerful multi-tracer generalization of theAlcock-Paczynski test that pairs redshift-free distance tracers and anoverlapping galaxy redshift survey. Cross-correlating $5\times 10^4$redshift-free SNe with DESI or Euclid outperforms the classical $D_L$-$z$ testwith spec-$z$s for all SN. Our method also applies to gravitational wave sirensor any redshift-free distance tracer.

Beyond the classical distance-redshift test: cross-correlating redshift-free standard candles and sirens with redshift surveys