Signatures of Modified Dispersion Relation of Graviton in the Cosmic
  Microwave Background
  The dispersion relation of graviton is a fundamental issue for fundamental
physics about gravity. In this paper we investigate how the modified dispersion
relation of graviton affects the cosmic microwave background (CMB) power
spectra, in particular the B-mode polarization. Our results will be useful to
test the dispersion relation of graviton at the energy scale around $10^{-29}$
eV.
