mike13 - 6 Quantum Gravity 6.1 Background to the Problem of Quantum Gravity Through the history of Physics unification of theories has proven very

mike13 - 6 Quantum Gravity 6.1 Background to the...

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6 Quantum Gravity 6.1 Background to the Problem of Quantum Gravity Through the history of Physics, unification of theories has proven very successful and gravity is now the only fundamental force not unified with quantum theory. It therefore seems the right step that physicists should be attempting for this unification. The field of physics concerned with this problem is quantum gravity. The aim of quantum gravity is not just to unite quantum mechanics and general relativity but must reduce to ordinary quantum mechanics in the limit of weak gravity and must reduce to “classical” general relativity in the limit of large actions. This is due to the independent success of the two theories. There are many theories that have been suggested in quantum gravity: some, theories of everything, try to unify gravity with the other fundamental forces while others simply try to quantize the gravitational field. Initial

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