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SUMMARY:Michael Berry (University of Bristol)
DTSTART:20210111T170000Z
DTEND:20210111T180000Z
DTSTAMP:20260423T024745Z
UID:QM3/28
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/QM3/28/">Geo
 metric phases and the separation of the world</a>\nby Michael Berry (Unive
 rsity of Bristol) as part of Quantum Matter meets Maths (IST\, Lisbon)\n\n
 \nAbstract\nThe waves that describe systems in quantum physics can carry i
 nformation about how their environment has been altered\, for example by f
 orces acting on them. This effect is the geometric phase. It also occurs i
 n the optics of polarised light\, where it goes back to the 1830s\; and it
  gives insight into the spin-statistics relation for identical quantum par
 ticles. The underlying mathematics is geometric: the phenomenon of paralle
 l transport\, which also explains how falling cats land on their feet\, an
 d why parking a car in a narrow space is difficult. Incorporating the back
 -reaction of the geometric phase on the dynamics of the changing environme
 nt exposes the unsolved problem of how strictly a system can be separated 
 from a slowly-varying environment\, and involves different mathematics: di
 vergent infinite series.\n
LOCATION:https://researchseminars.org/talk/QM3/28/
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