GRAVITATIONAL CHERENKOV RADIATION FROM EXTENDED THEORIES OF GRAVITY

@article{Laurentis2012GRAVITATIONALCR,
  title={GRAVITATIONAL CHERENKOV RADIATION FROM EXTENDED THEORIES OF GRAVITY},
  author={Mariafelicia De Laurentis and Salvatore Capozziello and Giuseppe Basini},
  journal={Modern Physics Letters A},
  year={2012},
  volume={27},
  pages={1250136}
}
We linearize the field equations for higher order theories of gravity that contain scalar invariants other than the Ricci scalar. We find that besides a massless spin-2 field (the standard graviton), the theory contains also spin-0 and spin-2 massive modes with the latter being, in general, ghost modes. The rate at which such particles would emit gravitational Cherenkov radiation is calculated for some interesting physical cases. 
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