| Abstract: |
Four dimensional topological field theory allows to define matter particles as charges of the gauge group
breaking the gauge symmetry at a point. This is analogous to Deser/Jackiw and t'Hooft particles in 3d gravity. The degrees of freedom of General Relativity can also be introduced by symmetry breaking of the same topological field theory. This provides a framework in which gravity and matter can be considered from a unified point of
view. In this framework we study scattering of matter particles due to quantum gravity effects.
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