Overview
- The peer-reviewed Nature Communications paper, led by University of Geneva researchers, measures how galaxies move relative to cosmic gravitational potentials.
- The findings show dark matter obeys Euler’s equations on cosmological scales, mirroring the behavior of ordinary matter.
- The analysis constrains any additional long-range force on dark matter to less than about 7% of gravity’s strength.
- The team compared galaxy redshift–based velocities with the depth of gravitational wells inferred from large-scale structure data.
- Forthcoming observations from LSST and DESI are expected to probe down to roughly 2% of gravity, allowing tighter tests of ultra-weak interactions.