Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2011-10-10
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
42 pages, document changed to match published version, in press; Ann. Phys. (N. Y.) (2012)
Scientific paper
10.1016/j.aop.2012.02.006
The present paper addresses open questions regarding the handling of the spin supplementary condition within the effective field theory approach to the post-Newtonian approximation. In particular it is shown how the covariant spin supplementary condition can be eliminated at the level of the potential (which is subtle in various respects) and how the dynamics can be cast into a fully reduced Hamiltonian form. Two different methods are used and compared, one based on the well-known Dirac bracket and the other based on an action principle. It is discussed how the latter approach can be used to improve the Feynman rules by formulating them in terms of reduced canonical spin variables.
Hergt Steven
Schaefer Gerhard
Steinhoff Jan
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