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SUMMARY:Causality Relations At Infinity - Peter Cameron (University of Cam
 bridge)
DTSTART:20200207T130000Z
DTEND:20200207T140000Z
UID:TALK136618@talks.cam.ac.uk
CONTACT:Nathan Johnson-McDaniel
DESCRIPTION:Motivated by an attempt to construct a theory of quantum gravi
 ty as perturbations around some flat background\, Penrose has shown that d
 espite being asymptotically flat\, there is an inconsistency between the c
 ausal structure at infinity of Schwarzschild and Minkowski spacetimes. Thi
 s suggests that such a perturbative approach cannot possibly work. However
 \, the proof of this inconsistency is specific to 4 spacetime dimensions. 
 In this talk I will discuss how this result extends to higher (and lower) 
 dimensions. More generally\, I will consider examples of how the causality
  properties of asymptotically flat spacetimes are affected by dimension an
 d by the presence of mass (both positive and negative).
LOCATION:Pavilion B Potter Room (B1.19)
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