Séminaire / Seminar GReCO |
| « 4.5 Post-Newtonian order gravitational radiation » |
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Tanguy Marchand |
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Post-Newtonian theory enables us to predict the waveform of the gravitational waves emitted by a system of two compact objects coalescing in its inspiral phase. State-of-the-art works provide the phase of the expected signal up to 3.5PN (i.e. up to 1/c^7). Comparison with numerical relativity, as well as the promising evolution of gravitational wave detectors incite us to pursue this computation to a higher order. In our current project, we are aiming at reaching phase of the signal at the 4.5PN order (i.e. 1/c^9). For this purpose, the flux emitted by such a system has to be known at 4.5PN. One difficulty of this computation is the high-order interactions - commonly called tails- between the mass of the system and its mass and current multipole moments during the propagation of the signal. After a broad introduction to Blanchet-Damour-Iyer formalism used to perform our computation, I will show how the work done in [1], has enabled us to determine the 4.5PN coefficient of the flux (while the 4PN coefficient is still unknown).
[1] Marchand T., Blanchet L., Faye G. Class.Quant.Grav. 33 (2016) no.24, 244003 |
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lundi 27 février 2017 - 11:00 Salle des séminaires Évry Schatzman Institut d'Astrophysique de Paris |
| Pages web du séminaire / Seminar's webpage |