The Case Against Smooth Null Infinity

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• Leonhard Kehrberger (DAMTP)
• Friday 29 January 2021, 13:00-14:00
• Zoom.

If you have a question about this talk, please contact Justin Ripley.

In this talk, we discuss various physical obstructions to Penrose’s proposal of smooth conformal compactification of spacetime (a.k.a. smooth null infinity or asymptotic simplicity) and the “peeling property” implied by it. More precisely, we will show that in the context of the N-body problem of GR, with no incoming radiation from past null infinity, one should expect that the asymptotic expansions of the Weyl tensor near future null infinity contain logarithmic terms at leading order and that hence the peeling property does not hold. Modelling gravitational radiation by scalar radiation, it will also be outlined why these logarithmic terms could in principle be measurable.

This talk is part of the DAMTP Friday GR Seminar series.

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