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SUMMARY:Semiclassical Canovaccio for Quantum Field Theory
DTSTART:20260319T123000Z
DTEND:20260319T143000Z
DTSTAMP:20260611T103100Z
UID:indico-event-1548@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Francesco Sannino\n\nQuantum field theory is the uni
 versal framework underlying particle physics\, critical phenomena\, gravit
 y\, and much of modern theoretical physics\, yet large parts of its strong
 ly interacting landscape remain analytically out of reach. In this colloqu
 ium I present a semiclassical canovaccio for quantum field theory: a frame
 work in which suitably chosen classical configurations provide the mathema
 tical skeleton for extracting nonperturbative information and lead to pred
 ictions for infinite order perturbative computations. After introducing co
 nformal field theories as especially tractable yet highly nontrivial corne
 rs of the QFT landscape\, I focus on the spectrum of composite operators\,
  with particular emphasis on the Ising conformal field theory. I show how 
 heavy composite operators admit a semiclassical description via the state-
 operator correspondence\, periodic classical motion on the cylinder\, and 
 Bohr-Sommerfeld quantization. This approach reorganizes the problem in a w
 ay that overcomes the breakdown of ordinary perturbation theory at large o
 perator number and yields analytic control over scaling dimensions beyond 
 leading order. I will discuss how this framework connects free theory intu
 ition\, interacting conformal dynamics\, and modern precision studies of t
 he 3d Ising CFT\, while suggesting a broader strategy for tackling difficu
 lt sectors of quantum field theory. \n\nhttps://conference.ippp.dur.ac.uk
 /event/1548/
URL:https://conference.ippp.dur.ac.uk/event/1548/
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