Title: Gravitational waves and gravitational-radiation reaction with post-Newtonian theory

Abstract:
Post-Newtonian theory plays a crucial role in the data analysis of gravitational waves (GWs) generated by compact binary systems. In this talk, after some general review of the field, we describe two recent calculations of GWs emitted by spinless compact binaries: 1) The energy flux and GW phasing at the fourth-and-a-half post-Newtonian (4.5PN) order beyond the Einstein quadrupole formula; to this order appears a new non-linear effect called "GW tails-of-memory", containing the modification of the memory effect at 2.5PN order due to GW tails. 2) The effect of gravitational-radiation reaction to 4.5PN order beyond the Newtonian acceleration; to this order we point out a subtlety in the definition of the frame of the center of mass which should take into account the GW recoil of the binary system.

Speaker: Luc Blanchet - Institut d'Astrophysique de Paris, France

Date and Time: September 11th, 2024 - 12pm GMT