Propagating Degrees of Freedom in f(R) Gravity

Yun Soo Myung
2016 Advances in High Energy Physics  
We have computed the number of polarization modes of gravitational waves propagating in the Minkowski background in f(R) gravity. These are three of two from transverse-traceless tensor modes and one from a massive trace mode, which confirms the results found in the literature. There is no massless breathing mode and the massive trace mode corresponds to the Ricci scalar. A newly defined metric tensor in f(R) gravity satisfies the transverse-traceless (TT) condition as well as the TT wave equation.
more » ... s the TT wave equation.
doi:10.1155/2016/3901734 fatcat:ta6o7a2pxfh2ffmttaiwnecshe