Infrared-modified gravities and massive gravitons

  title={Infrared-modified gravities and massive gravitons},
  author={Valery A. Rubakov and Peter G. Tinyakov}
We review some theoretical and phenomenological aspects of massive gravities in 4 dimensions. We start from the Fierz–Pauli theory with Lorentz-invariant mass terms and then proceed to Lorentz-violating masses. Unlike the former theory, some models with Lorentz-violation have no pathologies in the spectrum in flat and nearly flat backgrounds and lead to interesting phenomenology. 
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