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- W3103398535 abstract "We prove the renormalizability of various theories of classical gravity coupled with interacting quantum fields. The models contain vertices with dimensionality greater than four, a finite number of matter operators and a finite or reduced number of independent couplings. An interesting class of models is obtained from ordinary power-counting renormalizable theories, letting the couplings depend on the scalar curvature R of spacetime. The divergences are removed without introducing higher-derivative kinetic terms in the gravitational sector. The metric tensor has a non-trivial running, even if it is not quantized. The results are proved applying a certain map that converts classical instabilities, due to higher derivatives, into classical violations of causality, whose effects become observable at sufficiently high energies. We study acausal Einstein-Yang-Mills theory with an R-dependent gauge coupling in detail. We derive all-order formulas for the beta functions of the dimensionality-six gravitational vertices induced by renormalization. Such beta functions are related to the trace-anomaly coefficients of the matter subsector." @default.
- W3103398535 created "2020-11-23" @default.
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- W3103398535 date "2007-03-27" @default.
- W3103398535 modified "2023-10-16" @default.
- W3103398535 title "Renormalizable acausal theories of classical gravity coupled with interacting quantum fields" @default.
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- W3103398535 doi "https://doi.org/10.1088/0264-9381/24/8/003" @default.
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