Roberto Oliveri (Paris): Metric reconstruction for non-radiative spacetimes

Dienstag, 28. Juni 2022 14.00

Ort: TU Wien Freihaus, Wiedner Hauptstr. 8-10, 5. Stock, Sem.R. DA, grün 05

Multipole moments are important quantities to characterize spacetimes. In General Relativity, the most general vacuum solutionwith no incoming radiation is parametrized by two sets of infinite multipole moments.
In this talk, we focus on non-radiative spacetimes and provide a characterization thereof in terms of a tower of multipole moments. This tower encodes non-radiative and non-stationary features of the gravitational field at null infinity, and generalizes the Geroch-Hansen moments for stationary spacetimes. Moreover, such a tower of moments is identified with charges associated to the Lw1+∞ algebra recently discovered in the structure of asymptotically flat spacetimes.



Foto: Barbara Mair