BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:CP Violation and the Ordering of Limits in QCD with a Theta Parame
 ter
DTSTART:20260416T141500Z
DTEND:20260416T161500Z
DTSTAMP:20260417T151200Z
UID:indico-event-1392@indico.hiskp.uni-bonn.de
DESCRIPTION:Speakers: Andreas Ringwald (DESY)\n\nWe investigate the relati
 on between CP violation and the ordering of limits in QCD with a $\\theta$
  parameter. Starting from the exact canonical partition function defined b
 y the trace of the Boltzmann operator\, we show that taking the thermodyna
 mic limit at fixed topological charge yields a vacuum energy density indep
 endent of $\\theta$\, leading to an apparent absence of CP violation. This
  behavior is a general property of constrained ensembles and does not refl
 ect the physical properties of the theory. The $\\theta$-dependence of the
  vacuum energy arises from topological fluctuations of order $Q\\sim\\sqrt
 {V}$\, which are removed if the thermodynamic limit is taken before summin
 g over topological sectors. Our results clarify recent observations obtain
 ed with the reversed order of limits and show that they are not specific t
 o particular models or to the number of quark flavors.\n\nhttps://indico.h
 iskp.uni-bonn.de/event/1392/
URL:https://indico.hiskp.uni-bonn.de/event/1392/
END:VEVENT
END:VCALENDAR