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SUMMARY:Christopher Deninger (University of Münster)
DTSTART:20260929T140000Z
DTEND:20260929T150000Z
DTSTAMP:20261023T084344Z
UID:Geolis/184
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/Geolis/184/"
 >Entropy\, determinants and zeta values</a>\nby Christopher Deninger (Univ
 ersity of Münster) as part of Geometria em Lisboa (IST)\n\n\nAbstract\nIt
  was observed in the 1980's that the entropy of an action by two or more c
 ommuting automorphisms on a compact abelian group is sometimes given by a 
 zeta- or L-value. For example zeta(3) arises in this way. In the talk I wi
 ll report on joint work with Thu Hà Trieu\, which at least for expansive 
 actions explains the deeper reason for these observations by a combination
  of operator algebra theory\, in particular the theory of their determinan
 ts\, K-theory and cyclic and Deligne cohomology. The talk is addressed to 
 a general audience and will not go into technical details. Instead we will
  sketch the relevant theories and explain how to fit them together for our
  purpose.\n
LOCATION:https://researchseminars.org/talk/Geolis/184/
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