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SUMMARY:Lefschetz-thimble approach to the Silver Blaze problem of one-site
fermion model
DTSTART;VALUE=DATE-TIME:20160727T082000Z
DTEND;VALUE=DATE-TIME:20160727T084000Z
DTSTAMP;VALUE=DATE-TIME:20200603T224604Z
UID:indico-contribution-2724@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Yuya Tanizaki (RIKEN BNL Research Center)\nPath inte
gral on Lefschetz thimbles gets much attention in the context of the sign
problem\, because of its usefulness in order to study the system with the
complex classical action nonperturbatively. After giving its brief introdu
ction\, it is applied for studying the sign problem of the one-site Hubbar
d model. This model has a severe sign problem\, which looks quite similar
to that of the finite-density QCD at low temperatures. We present the anal
ytical study of the sign problem using the Lefschetz-thimble method\, and
also discuss the failure of the complex Langevin method. Furthermore\, we
give a speculation about the early-onset problem of the baryon number dens
ity\, called the baryon Silver Blaze problem\, based on similarity between
the sign problems of one-site Hubbard model and of finite-density QCD.\n\
nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2724/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2724/
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