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SUMMARY:The Problem of Time in Quantum Gravity - Dr Edward Anderson\, Pete
 rhouse and DAMTP
DTSTART:20070205T163000Z
DTEND:20070205T180000Z
UID:TALK6584@talks.cam.ac.uk
CONTACT:Jeremy Nicholas Butterfield
DESCRIPTION:A different thing is meant by `time' in QM and GR. This gets i
 n the way of being able to combine the two theories into a coherent whole 
 -- the problem of time. I will consider Kuchar's and Isham's reviews on th
 is from around 14 years ago. These consider for canonical GR in traditiona
 l `metric variables' 10 conceptual strategies in three families 1) time be
 fore quantization\, 2) time after quantization\, 3) no time at all\, and h
 ow none of these quite works upon detailed examination. I will make some n
 aive philosophical comments about these\, and will then discuss how the pi
 cture has changed somewhat since (but the problem of time has certainly no
 t been resolved). That involves the growth of histories theory\, the addit
 ion of more timeless approaches and how some of the strategies may combine
  rather than being distinct strands of thought.\n
LOCATION:Meeting Room 14\, Centre for Mathematical Sciences
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