Controversial new theory of gravity rules out need for dark matter

Exclusive: Paper by UCL professor says wobbly' space-time could instead explain expansion of universe and galactic rotation

Dark matter is supposed to account for 85% of the mass in the universe, according to conventional scientific wisdom. But proponents of a radical new theory of gravity, in which space-time is wobbly", say their approach could render the elusive substance obsolete.

The proposition, outlined in a new paper, raises the controversial possibility that dark matter, which has never been directly observed, is a mirage that a substantial portion of the physics community has been chasing for several decades. The theory is viewed as quite left-field and is yet to be thoroughly tested, but the latest claims are creating a stir in the world of physics.

Announcing the paper on X, Prof Jonathan Oppenheim, of University College London, said: Folks, something seems to be happening. We show that our theory of gravity ... can explain the expansion of the universe and galactic rotation without dark matter or dark energy."