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SUMMARY:The Case Against Smooth Null Infinity - Leonhard Kehrberger (DAMTP
 )
DTSTART:20210129T130000Z
DTEND:20210129T140000Z
UID:TALK155080@talks.cam.ac.uk
CONTACT:Justin Ripley
DESCRIPTION:In this talk\, we discuss various physical obstructions to Pen
 rose'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 f
 uture null infinity contain logarithmic terms at leading order and that he
 nce\nthe peeling property does not hold. Modelling gravitational radiation
  by scalar radiation\, it will also be outlined why these logarithmic term
 s could in principle be measurable.
LOCATION:Zoom
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