Evanescent Effects can Alter Ultraviolet Divergences in Quantum Gravity without Physical Consequences.

@article{Bern2015EvanescentEC,
  title={Evanescent Effects can Alter Ultraviolet Divergences in Quantum Gravity without Physical Consequences.},
  author={Z. Bern and C. Cheung and Huan-Hang Chi and Scott Davies and L. Dixon and Josh Nohle},
  journal={Physical review letters},
  year={2015},
  volume={115 21},
  pages={
          211301
        }
}
Evanescent operators such as the Gauss-Bonnet term have vanishing perturbative matrix elements in exactly D=4 dimensions. Similarly, evanescent fields do not propagate in D=4; a three-form field is in this class, since it is dual to a cosmological-constant contribution. In this Letter, we show that evanescent operators and fields modify the leading ultraviolet divergence in pure gravity. To analyze the divergence, we compute the two-loop identical-helicity four-graviton amplitude and determine… Expand

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