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Scattering Cross-Sections in Quantum Gravity—The Case of Matter-Matter Scattering

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DOI: 10.4236/jmp.2015.63032    4,439 Downloads   4,762 Views   Citations

ABSTRACT

Viewing gravitational energy-momentum PGμ as equal by observation, but different in essence from inertial energy-momentum PIμ naturally leads to the gauge theory of volume-preserving diffeomorphisms of a four-dimensional inner space. To analyse scattering in this theory, the gauge field is coupled to two Dirac fields with different masses. Based on a generalized LSZ reduction formula the S-matrix element for scattering of two Dirac particles in the gravitational limit and the corresponding scattering cross-section are calculated to leading order in perturbation theory. Taking the non-relativistic limit for one of the initial particles in the rest frame of the other the Rutherford-like cross-section of a non-relativistic particle scattering off an infinitely heavy scatterer calculated quantum mechanically in Newtonian gravity is recovered. This provides a non-trivial test of the gauge field theory of volume-preserving diffeomorphisms as a quantum theory of gravity.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Wiesendanger, C. (2015) Scattering Cross-Sections in Quantum Gravity—The Case of Matter-Matter Scattering. Journal of Modern Physics, 6, 273-282. doi: 10.4236/jmp.2015.63032.

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