BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:The C*-algebra of sequin fabric [MPIM]
DTSTART:20260219T140000Z
DTEND:20260219T150000Z
DTSTAMP:20260417T221500Z
UID:indico-event-1128@math-events.uni-bonn.de
DESCRIPTION:Speakers: Eva-Maria Hekkelman (MPIM)\n\nMPI-Oberseminar\nThe (
 co)sphere bundle on Riemannian manifolds can be imagined in 2 dimensions a
 s a kind of sequin fabric\, the discs-ornamented material incorporated in 
 many carnival costumes. I'll give a gentle introduction to pseudodifferent
 ial operators\, and show that their principal symbol lives as a function o
 n the cosphere bundle. Then\, I'll discuss how these operators give rise t
 o a flow on the cosphere bundle -- for the Laplace operator this is the ge
 odesic flow. Writing this in a C*-algebraic manner\, the cosphere bundle a
 nd geodesic flow can be generalised to noncommutative geometry. Based on j
 oint work with Edward McDonald\, I will show how this can be connected to 
 the spread of eigenfunctions (Quantum Ergodicity) via spectral truncations
  of spectral triples -- connecting to work by Connes and van Suijlekom.\n\
 nhttps://math-events.uni-bonn.de/event/1128/
LOCATION:MPIM\, Vivatsgasse\,  7 - Lecture Hall (Max Planck Institute for 
 Mathematics)
URL:https://math-events.uni-bonn.de/event/1128/
END:VEVENT
END:VCALENDAR