Leading order finite size effects with spins for inspiralling compact binaries

Abstract

The leading order finite size effects due to spin, namely that of the cubic and quartic in spin interactions, are derived for the first time for generic compact binaries via the effective field theory for gravitating spinning objects. These corrections enter at the third and a half and fourth post-Newtonian orders, respectively, for rapidly rotating compact objects. Hence, we complete the leading order finite size effects with spin up to the fourth post-Newtonian accuracy. We arrive at this by augmenting the point particle effective action with new higher dimensional nonminimal coupling worldline operators, involving higher-order derivatives of the gravitational field, and introducing new Wilson coefficients, corresponding to constants, which describe the octupole and hexadecapole deformations of the object due to spin. These Wilson coefficients are fixed to unity in the black hole case. The nonminimal coupling worldline operators enter the action with the electric and magnetic components of the Weyl tensor of even and odd parity, coupled to even and odd worldline spin tensors, respectively. Moreover, the non relativistic gravitational field decomposition, which we employ, demonstrates a coupling hierarchy of the gravito-magnetic vector and the Newtonian scalar, to the odd and even in spin operators, respectively, which extends that of minimal coupling. This observation is useful for the construction of the Feynman diagrams, and provides an instructive analogy between the leading order spin-orbit and cubic in spin interactions, and between the leading order quadratic and quartic in spin interactions.

18 pages, 3 figures; v2: published; v3: ref. id fixed

References in corpus (4)

• Cubic order spin effects in the dynamics and gravitational wave energy flux of compact object binaries
• Non-Relativistic Gravitation: From Newton to Einstein and Back
• Equivalence of ADM Hamiltonian and Effective Field Theory approaches at next-to-next-to-leading order spin1-spin2 coupling of binary inspirals
• Reduced Hamiltonian for next-to-leading order Spin-Squared Dynamics of General Compact Binaries

Cited by in corpus (8)

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• Spin supplementary conditions for spinning compact binaries
• Classical gravitational scattering from a gauge-invariant double copy
• Post-Newtonian Lagrangian of an N-body System with Arbitrary Mass and Spin Multipoles
• Dynamical Love Numbers for Black Holes and Beyond from Shell Effective Field Theory