Probing the benefits of a new approach for constructing templates for spinning compact binaries

The benefits of specifying orbital and spin angular momentum vectors in an invariant frame associated with the initial direction of total angular momentum j˳ while constructing ready-to-use gravitational waveforms for spinning compact binaries are probed. We show that the dominant spin is likely to have orientations 90° from j˳ when isolated unequal mass spinning compact binaries spiral into initial frequencies of GW observatories if the larger spin exceeds the orbital angular momentum at these frequencies. For orbital angular momentum dominated binaries, it is rather difficult to provide similar constraints on the dominant spin orientations though they are fairly likely to be in the neighborhood of the first quadrant. In contrast, the dominant spin orientations are rather unconstrained in the traditional GW phasing approach. With the help of these inferences, we argue that the number of templates, required to span angular sectors of associated signal manifolds, should be substantially smaller in our GW phasing prescription. Ongoing efforts to constrain sub-dominant  spin orientations at initial frequencies of GW observatories will also be presented.