Theory of post-Newtonian radiation and reaction

Ofek Birnholtz*, Shahar Hadar, Barak Kol

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

We address issues with extant formulations of dissipative effects in the effective field theory (EFT) which describe the post-Newtonian (PN) inspiral of two gravitating bodies by (re)formulating several parts of the theory. Novel ingredients include gauge-invariant spherical fields in the radiation zone; a system zone that preserves time reversal such that its violation arises not from local odd propagation but rather from interaction with the radiation sector in a way that resembles the balayage method; two-way multipoles to perform zone matching within the EFT action; and a double-field radiation-reaction action that is the nonquantum version of the closed time path formalism and generalizes to any theory with directed propagators including theories that are defined by equations of motion rather than an action. This formulation unifies the treatment of outgoing radiation and its reaction force. We demonstrate the method in the scalar, electromagnetic, and gravitational cases by economizing the following: the expression for the radiation source multipoles; the derivation of the leading outgoing radiation and associated reaction force such that it is maximally reduced to mere multiplication; and the derivation of the gravitational next-to-leading PN order. In fact we present a novel expression for the +1PN correction to all mass multipoles. We introduce useful definitions for multi-index summation, for the normalization of Bessel functions, and for the normalization of the gravitomagnetic vector potential.

Original languageAmerican English
Article number104037
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume88
Issue number10
DOIs
StatePublished - 27 Nov 2013

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