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BEGIN:VEVENT
SUMMARY:Marcos Marino (Geneva)
DTSTART:20210914T080000Z
DTEND:20210914T090000Z
DTSTAMP:20260422T225704Z
UID:Sem21/1
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/Sem21/1/">Re
 surgence and renormalons in quantum field theory</a>\nby Marcos Marino (Ge
 neva) as part of SEU Yau Center Theoretical Physics Seminars 2021\n\n\nAbs
 tract\nPerturbation theory remains the most general approach to understand
 ing generic quantum theories. However\, the series obtained in this way ar
 e usually divergent and need to be complemented by additional\, non-pertur
 bative information. The theory of resurgence is a framework to make sense 
 of divergent series by using resummation techniques and including non-pert
 urbative information in the form of “trans-series". In quantum mechanics
 \, many observables can be fully understood by using the theory of resurge
 nce\, but quantum field theories are more challenging. In realistic quantu
 m field theories\, the main source of non-perturbative corrections to the 
 perturbative series are the so-called renormalons\, which remain mysteriou
 s objects. In this talk I will present the basics of the theory of resurge
 nce and some successful applications in quantum mechanics. I will then mov
 e to quantum field theories. In order to address the problems due to renor
 malons\, I will focus on integrable\, asymptotically free theories in two 
 dimensions where one can make very explicit analysis. I will show in concr
 ete examples that observables can be computed by trans-series due to renor
 malons\, and I will discuss more generally the virtues and limits of the r
 esurgent approach.\n
LOCATION:https://researchseminars.org/talk/Sem21/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Zoltan Bajnok (Wigner Institute)
DTSTART:20211012T080000Z
DTEND:20211012T090000Z
DTSTAMP:20260422T225704Z
UID:Sem21/2
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/Sem21/2/">Fr
 om perturbative to non-perturbative in the O(4) sigma model</a>\nby Zoltan
  Bajnok (Wigner Institute) as part of SEU Yau Center Theoretical Physics S
 eminars 2021\n\n\nAbstract\nIs it possible to derive non-perturbative cont
 ributions in a quantum field theory knowing only the perturbative coeffici
 ents? We answer this question affirmatively based on the careful analysis 
 of the integrable two dimensional O(4) sigma model. We investigate its gro
 und state energy in a magnetic field\, for which integrability provides an
  exact linear integral equation. By cleverly expanding this equation we co
 uld calculate a large number of very precise\, factorially growing perturb
 ative coefficients. By investigating their asymptotical behaviour on the B
 orel plane we managed to reveal a nice resurgence structure leading to the
  first few exponentially suppressed non-perturbative terms of the ambiguit
 y free trans-series. We checked our results against the direct numerical s
 olution of the exact integral equation and find complete agreement. (based
  on 2011.12254 and 2011.09897)\n
LOCATION:https://researchseminars.org/talk/Sem21/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cyril Closset (Birmingham)
DTSTART:20211019T080000Z
DTEND:20211019T090000Z
DTSTAMP:20260422T225704Z
UID:Sem21/3
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/Sem21/3/">Th
 e U-plane of rank-one 4d N=2 KK theories</a>\nby Cyril Closset (Birmingham
 ) as part of SEU Yau Center Theoretical Physics Seminars 2021\n\n\nAbstrac
 t\nI will revisit the Seiberg-Witten description of the Coulomb branch of 
 rank-one 4d N=2 supersymmetric QFTs\, including aspects of the global symm
 etry\, from the point of view of rational elliptic surfaces. This will inc
 lude\, in particular\, a detailed study of the 5d superconformal field the
 ories with E_n symmetry\, compactified on a circle. I will also sketch how
  to derive BPS quivers from that perspective. Interesting modular properti
 es of the SW geometries will play a key role.\n
LOCATION:https://researchseminars.org/talk/Sem21/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yiming Chen (Princeton)
DTSTART:20211026T120000Z
DTEND:20211026T130000Z
DTSTAMP:20260422T225704Z
UID:Sem21/4
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/Sem21/4/">As
 pects of the black hole/string transition</a>\nby Yiming Chen (Princeton) 
 as part of SEU Yau Center Theoretical Physics Seminars 2021\n\nAbstract: T
 BA\n
LOCATION:https://researchseminars.org/talk/Sem21/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:John Cardy (Berkeley)
DTSTART:20211109T010000Z
DTEND:20211109T020000Z
DTSTAMP:20260422T225704Z
UID:Sem21/5
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/Sem21/5/">A 
 Physical Interpretation of the TTbar Deformation of 2d Field Theory</a>\nb
 y John Cardy (Berkeley) as part of SEU Yau Center Theoretical Physics Semi
 nars 2021\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/Sem21/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pietro Longhi (ETH)
DTSTART:20211102T090000Z
DTEND:20211102T100000Z
DTSTAMP:20260422T225704Z
UID:Sem21/6
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/Sem21/6/">Qu
 ivers\, affine symmetries and wall-crossing invariance</a>\nby Pietro Long
 hi (ETH) as part of SEU Yau Center Theoretical Physics Seminars 2021\n\nAb
 stract: TBA\n
LOCATION:https://researchseminars.org/talk/Sem21/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Shouvik Datta (CERN)
DTSTART:20211101T080000Z
DTEND:20211101T090000Z
DTSTAMP:20260422T225704Z
UID:Sem21/9
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/Sem21/9/">Op
 erator growth in 2d CFTs</a>\nby Shouvik Datta (CERN) as part of SEU Yau C
 enter Theoretical Physics Seminars 2021\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/Sem21/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fabio Apruzzi (AEC Bern)
DTSTART:20211116T070000Z
DTEND:20211116T080000Z
DTSTAMP:20260422T225704Z
UID:Sem21/11
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/Sem21/11/">2
 -groups in 5d and 6d theories</a>\nby Fabio Apruzzi (AEC Bern) as part of 
 SEU Yau Center Theoretical Physics Seminars 2021\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/Sem21/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hernán González (Adolfo Ibanez)
DTSTART:20211207T110000Z
DTEND:20211207T120000Z
DTSTAMP:20260422T225704Z
UID:Sem21/13
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/Sem21/13/">T
 he structure of IR divergences in celestial gluon amplitudes</a>\nby Hern
 án González (Adolfo Ibanez) as part of SEU Yau Center Theoretical Physic
 s Seminars 2021\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/Sem21/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Carlos Nunez (Swansea)
DTSTART:20220111T070000Z
DTEND:20220111T080000Z
DTSTAMP:20260422T225704Z
UID:Sem21/14
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/Sem21/14/">A
 spects of gauge-strings duality</a>\nby Carlos Nunez (Swansea) as part of 
 SEU Yau Center Theoretical Physics Seminars 2021\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/Sem21/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Wei Song (YMSC Tsinghua)
DTSTART:20211208T070000Z
DTEND:20211208T080000Z
DTSTAMP:20260422T225704Z
UID:Sem21/15
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/Sem21/15/">A
  BMS-invariant free scalar model</a>\nby Wei Song (YMSC Tsinghua) as part 
 of SEU Yau Center Theoretical Physics Seminars 2021\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/Sem21/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gang Yang (ITP-CAS)
DTSTART:20220105T060000Z
DTEND:20220105T070000Z
DTSTAMP:20260422T225704Z
UID:Sem21/17
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/Sem21/17/">C
 olor-kinematics duality and double-copy of form factors</a>\nby Gang Yang 
 (ITP-CAS) as part of SEU Yau Center Theoretical Physics Seminars 2021\n\nA
 bstract: TBA\n
LOCATION:https://researchseminars.org/talk/Sem21/17/
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