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SUMMARY:Stable commutator length on RAAGs - Nicolaus Heuer (University of 
 Cambridge)
DTSTART:20210122T134500Z
DTEND:20210122T144500Z
UID:TALK155146@talks.cam.ac.uk
CONTACT:76015
DESCRIPTION:The stable commutator length scl(g) of an element g in a group
  G measures the least complexity of a surface to “fill” g. Stable comm
 utator length on non-abelian free groups is now fairly well understood but
  some questions remain open: Which rational numbers arise as scls? What is
  the distribution of scl for random elements? What is the gap for chains o
 f scl?\nI will give a partial answer to all of these questions for right-a
 ngled Artin groups (RAAGs). If time permits\, I will also show that comput
 ing scl in RAAGs is (unlike in free groups) NP-hard.\nThis is joint work w
 ith Lvzhou Chen.\n\n
LOCATION:Zoom https://maths-cam-ac-uk.zoom.us/j/95208706709
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