Talk detail

Participant	Steinhoff, Jan
Institution	Albert Einstein Institute - Am Mühlenberg 1 - Potsdam-Golm - Brandenburg - Germany

Session	BN9	Accepted	Yes	Order	7	Time	17:40	20'
Talk	Oral abstract	Title	Effective actions for n-pole point particles
Coauthors
Abstract	We discuss how a point-particle effective action can be constructed based on irreducible representations of the Poincare group, analogous to elementary particle fields. The action leads to equations of motion which can be of the form of the Matthisson-Papapetrou-Dixon equations, but they can also take on a different structure. We discuss subtleties coming from different supplementary conditions on the spin that can be imposed, on the canonical structure of the variables, and applications to binaries of extreme mass-ratio.
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Session	BN6	Accepted	Yes	Order	3	Time	16:10	25'
Talk	Oral abstract	Title	Spin, tidal, and modified gravity effects in the post-Newtonian approximation
Coauthors
Abstract	The gravitational interaction of a binary system is dominated by the mass-monopoles of the bodies. However, the structure of the bodies leads to spin and tidal effects, which leave an imprint in the dynamics and gravitational radiation of a binary at subleading orders. We discuss how these effects can be incorporated in the post-Newtonian approximation. We furthermore discuss how a modification of gravity away from general relativity could influence the internal structure of the bodies and associated post-Newtonian effects. We comment on post-Newtonian formalisms with an emphasis on Hamiltonian methods.
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