Gravitational Waves in Generalised Brans-Dicke Theory

We have solved cosmological gravitational Wave(GW)equation in the frame work of Generalised Brans-Dicke(GBD) theory for all epochs of the Universe.The solutions are expressed in terms of the present value of the Brans-Dicke coupling parameter $\omega (\varphi )$.It is seen that the solutions represent travelling growing modes for negative values of ${\omega }_0$ for all epochs of the Universe.