The Graviton

24 Nov, 2005 530 Physics

Melvyn Bragg and guests discuss the search for the Graviton particle. Albert Einstein said “I know why there are so many people who love chopping wood. In this activity one immediately sees the results”. Einstein spent the last thirty years of his life trying to find a theory that would unify electromagnetism with gravity, but success eluded him. The search is still on for a unifying theory of gravitational force and hopes are pinned on the location of the graviton - a hypothetical elementary particle that transmits the force of gravity. But the graviton is proving hard to find. Indeed, the Large Hadron Collider at CERN still won’t allow us to detect gravitons per se, but might be able to prove their existence in other ways. The idea of the graviton particle first emerged in the middle of the 20th century, when the notion that particles as mediators of force was taken seriously. Physicists believed that it could be applicable to gravity and by the late 20th century the hunt was truly on for the ultimate theory, a theory of quantum gravity. So why is the search for the graviton the major goal of theoretical physics? How will the measurement of gravitation waves help prove its existence? And how might the graviton unite the seemingly incompatible theories of general relativity and quantum mechanics?

Play on BBC Sounds website


  • Roger Cashmore 2 episodes
    Former Research Director at CERN and Principal of Brasenose College, Oxford
  • Jim Al-Khalili 8 episodes
    Professor of Physics at the University of Surrey
  • Sheila Rowan 2 episodes
    Reader in Physics in the Department of Physics and Astronomy at the University of Glasgow

Related episodes

Programme ID: p003k9ks

Episode page:

Auto-category: 530 (Physics)

Hello (First sentence from this episode) Hello, Albert Einstein said, I know why there are so many people who love chopping wood.