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SUMMARY:Johannes Knaute (Albert Einstein Institute\, Potsdam)
DTSTART:20201022T133000Z
DTEND:20201022T143000Z
DTSTAMP:20260423T011219Z
UID:HEP-TN/9
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/HEP-TN/9/">F
 rom spin chains to real-time thermal field theory using tensor networks</a
 >\nby Johannes Knaute (Albert Einstein Institute\, Potsdam) as part of HEP
 -tensor network seminars\n\n\nAbstract\nOne of the most interesting direct
 ions in theoretical high-energy and condensed-matter physics is understand
 ing dynamical properties of collective states of quantum field theories. T
 he most elementary tool in this quest is retarded equilibrium correlators 
 governing the linear response theory. In this talk\, I will describe how t
 ensor networks can be used to determine retarded correlators in an ab init
 io way for a class of (1 + 1)-dimensional quantum field theories that aris
 e as infrared descriptions of quantum Ising chains. I will show that\, com
 plemented with signal analysis using the Prony method\, tensor network cal
 culations for intermediate times provide a powerful way to explore the str
 ucture of singularities of the correlator in the complex frequency plane a
 nd to make predictions about the thermal response to perturbations in a cl
 ass of nonintegrable interacting quantum field theories. The talk is based
  on arXiv:1912.08836. Time permitting\, I will also mention some follow-up
  directions emerging from this line of research.\n
LOCATION:https://researchseminars.org/talk/HEP-TN/9/
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