Quote:
Originally Posted by sjastro
Craig,
The vacuum is a field in the lowest or ground state. There are different types of vacuums, such as the quantum electrodynamic (QED) vacuum or the quantum chromodynamic (QED) vacuum.
The issue with gravity as a Quantum Field theory is that it is non- renormalizable. A gravitational interaction between 2 particles changes the particles from a state A to a state B. If you sum all the momenta going from state A to B you end up with infinite values. This is prevalent at the Planck scale. There is no way you can renormalize or "cut out" the infinite terms as you can with QED or QCD.
This is where string theory is an advantage. By making your strings larger than the Planck scale, the infinities are averted.
Regards
Steven
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Thanks Steven …
More reading to do on all this I'm afraid ..
Cheers