Séminaire / Seminar GReCO |
| « Radiation-reaction forces between two binary systems » |
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Adrien Kuntz |
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Radiation-reaction forces originating from the emission of
gravitational waves bring binaries to close proximity and are thus responsible for virtually all the mergers that we can observe in interferometers. I will show that there exists a supplementary radiation-reaction force between two binaries interacting gravitationally, changing in particular the decay rate of the semimajor axis under the emission of gravitational waves. This new binary-binary force is in some settings of the same order-of-magnitude than the usual 2.5PN radiation-reaction force for an isolated binary and presents some striking features such as a dependence on retarded time even in the post-Newtonian regime where all velocities are arbitrarily small. I will introduce an Effective Field Theory framework from which I will derive the full expression of the force, showing that it interpolates between several known formulas in different limiting regimes. |
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lundi 23 septembre 2024 - 11:00 Salle des séminaires Évry Schatzman Institut d'Astrophysique de Paris |
| Pages web du séminaire / Seminar's webpage |