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14.06.2023 (Wednesday)

The partial Bondi gauge: Further enlarging the asymptotic structure of gravity

Regular Seminar Celine Zwikel (Perimeter)

at:
13:45 KCL
room K0.16
abstract:

I will introduce the partial Bondi gauge for 4-dimensional spacetimes. This gauge includes the usual Bondi gauge and Newman-Unti gauge and is designed to approach asymptotic boundaries along null rays. The new gauge is defined by three conditions on the metric (g_{rr}=0=g_{rA}) and relaxes the condition on the radial coordinate. I will discuss the solution space and asymptotic symmetries. Most importantly, by relaxing the gauge, we uncover new large symmetries that characterize asymptotically flat spacetimes.