• Question: what is the unification of gravitation using quantum chromodynamics?

    Asked by skizza09 to Adam, Geoff, Rob, Sheila, Suzie on 21 Mar 2011 in Categories: .
    • Photo: Geoff McBride

      Geoff McBride answered on 18 Mar 2011:

      People are still working on a unified theory lots of debate but no real consensus

    • Photo: Suzie Sheehy

      Suzie Sheehy answered on 18 Mar 2011:

      The ‘holy grail’ of particle physics is being to explain all of the forces in nature with one theory – the thing that’s left out most of the time is gravity, it just doesn’t fit in with most of the other theories. Quantum chromodynamics (QCD) is the theory that describes the nuclear strong force – the forces between quarks and gluons inside protons and other hadrons. It would be great if we could unify this with gravity and with the other main force – electroweak theory, which incorporates electromagnetic forces and the weak nuclear force.

    • Photo: Adam Tuff

      Adam Tuff answered on 19 Mar 2011:

      The short answer is its heading towards the grand unified theory, relating all the forces. In this case it’s the gravitational force with the strong nuclear force.

    • Photo: Sheila Kanani

      Sheila Kanani answered on 20 Mar 2011:

      In theoretical physics, quantum chromodynamics (QCD) is a theory of the strong interaction. This is a fundamental force describing the interactions of the quarks and gluons making up hadrons (protons and neutrons). At the moment it is still a theory though!

      QCD has two main facts:
      1. “Confinement”, which means that the force between quarks doesnt decrease as they are separated. Because of this, it would take an infinite amount of energy to separate two quarks.
      2. “Asymptotic freedom”, which means that in very high-energy reactions, quarks and gluons interact very weakly.

      If you can pull together the theory of QCD and gravity then this could be evidence of the Grand Unified Theory (GUT) which says that everything, including gravity, comes from one single law.

    • Photo: Robert Simpson

      Robert Simpson answered on 21 Mar 2011:

      I have no idea.