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Quantum gravity, fakeons and microcausality
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DOI：10.1007/JHEP11(2018)021.png)
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Abstract
En 中文
We investigate the properties of fakeons in quantum gravity at one loop. The theory is described by a graviton multiplet, which contains the fluctuation h of the metric, a massive scalar phi and the spin-2 fakeon . The fields phi and are introduced explicitly at the level of the Lagrangian by means of standard procedures. We consider two options, where phi is quantized as a physical particle or a fakeon, and compute the absorptive part of the self-energy of the graviton multiplet. The width of , which is negative, shows that the theory predicts the violation of causality at energies larger than the fakeon mass. We address this issue and compare the results with those of the Stelle theory, where is a ghost instead of a fakeon.
Keywords:
Beyond Standard Model
Models of Quantum Gravity
Renormalization Regularization and Renormalons
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