| DATE: |
2005-01-28 12:15 - |
| PLACE: |
Kenkyu Honkan 2F RM 220 |
| TITLE: |
Background independent perturbative quantum gravity |
| CONTACT: |
tango |
| SPEAKER: |
Dr. Artem Starodubtsev (PerimeterInst. for Theor. Phys.) |
| LANGUAGE: |
English |
| ABSTRACT: |
We recast the action principle of General Relativity in four dimensions so that it can be treated perturbatively and at the same time kept exactly diffeomorphism invariant order by order. The coupling constant becomes dimensionless $G_{Newton} \Lambda$ and extremely small $10^{-120}$. We construct the perturbation theory using the generating functional technique in spinfoam approach. The result, however, is completely independent of discretization and can be expressed in a certain diagrammatic language of knot thery. Matter particles can be introduced as local charges of the gauge group. The perturbation theory allows to calculate their scattering due to quantum gravity effects. The result is unambiguous and finite. |
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