Séminaire / Seminar GReCO |
| « News from the Robinson–Trautman Spacetime » |
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Ali Seraj |
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The Robinson–Trautman (RT) spacetime is an algebraically special solution of
the vacuum Einstein equations with interesting properties. The radiative nature of this spacetime is obscured by the usual coordinate system used to describe it. I will derive the coordinate transformations to bring the metric into a Bondi–Sachs form and thereby read off radiative data. I will show that, in the absence of radiation, the solution corresponds to the vacuum sector of Euclidean Liouville theory. Moreover, upon linearization, the solution is a superposition of special quasi-normal modes of the Schwarzschild black hole. Finally, nonlinear effects—including memory—and the emergence of resonant modes in the radiation will be discussed. |
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lundi 27 octobre 2025 - 11:00 Salle des séminaires Évry Schatzman Institut d'Astrophysique de Paris |
| Pages web du séminaire / Seminar's webpage |