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Dark Matter Follows Same Gravitational Laws as Ordinary Matter

  • On November 3, 2025, a team led by the University of Geneva published new dark matter results in Nature Communications, describing this as a major step forward with contributions from the University of Portsmouth.
  • To answer whether dark matter follows ordinary laws, researchers probed whether a hypothetical fifth force would alter galaxy motions so they fall into gravitational wells differently.
  • Using cosmological data, the team compared galaxies' velocities with gravitational-well depths and applied Euler's equations to test for extra forces, Camille Bonvin explained.
  • The study places an upper bound on any fifth force, constraining it to at most 7% of gravity while noting that the Legacy Survey of Space and Time and Dark Energy Spectroscopic Instrument will probe down to 2%.
  • The findings sharpen the characterisation of dark matter, noting it is five times more abundant than ordinary matter, while DESI's slice shows less than 0.1 per cent of its volume and LSST and DESI will probe forces as weak as 2% of gravity.
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Physics World broke the news in on Tuesday, August 12, 2025.
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