SÉMINAIRE DU GRECO
"The motion of small objects in curved spacetime: An introduction to gravitational selfforce" 

Adam Pound 

The gravitational selfforce describes the effect of a small object's gravitational field on its own motion. Incorporating this effect with high accuracy is essential in modelling binary inspirals with extreme mass ratios. It has also proven to be an important tool for improving postNewtonian and effectiveonebody models. I outline the foundations of the selfforce in perturbation theory, focusing on methods of matched asymptotic expansions, in which one accounts for the finite size of the small object. I then discuss recent results for the selfforce at second order in perturbation theory. These secondorder results promise to be sufficiently accurate to extract extrememassratio inspiral parameters from detected waveforms, and they can be used to push the perturbative model toward intermediate and comparable mass ratios.


lundi 18 novembre 2013  11:00 Salle des séminaires François Arago, Institut d'Astrophysique de Paris 
