DR. ACHAMVEEDU GOPAKUMAR

We develop a prescription to construct ready-to-use gravitational waveforms for spinning compact binaries while invoking the orbital angular momentum rather than its Newtonian counterpart to describe the inspiraling orbits. In our approach, temporally evolving GW polarization states are specified by nine independent parameters, compared to eleven in the traditional approach, as we freely specify the spin vectors in an invariant frame associated with the initial direction of total angular momentum. It turned out that such a reduction is rather difficult to achieve in the traditional approach where the spin vectors are freely specified in an orbital triad at the initial epoch and list a number of undesirable consequences of the traditional approach including the existence of unphysical third post-Newtonian order terms in the GW phase evolution. Subtleties involved while incorporating orbital eccentricity will also be presented.