BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Spontaneous symmetry breaking induced by complex fermion determina
nt --- yet another success of the complex Langevin method
DTSTART;VALUE=DATE-TIME:20160726T144000Z
DTEND;VALUE=DATE-TIME:20160726T150000Z
DTSTAMP;VALUE=DATE-TIME:20200602T062211Z
UID:indico-contribution-2532@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Yuta Ito (KEK)\nIn many interesting systems\, the fe
rmion determinant becomes complex and its phase plays a crucial role in th
e determination of the vacuum. For instance\, in finite density QCD at low
temperature and high density\, exotic fermion condensates are conjectured
to form due to such effects. When one applies the complex Langevin method
to such a complex action system naively\, one cannot obtain the correct r
esults because of the singular-drift problem associated with the appearanc
e of small eigenvalues of the Dirac operator. Here we propose to add a fer
mion bilinear term to the action to avoid this problem and extrapolate its
coefficient to zero. We test this idea in an SO(4)-invariant matrix model
with a Gaussian action and a complex fermion determinant\, whose phase is
expected to induce the spontaneous breaking of the SO(4) symmetry. Our re
sults agree well with the previous results obtained by the Gaussian expans
ion method.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2
532/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2532/
END:VEVENT
END:VCALENDAR