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BEGIN:VEVENT
SUMMARY:Marcos Marino (Geneva)
DTSTART:20210914T080000Z
DTEND:20210914T090000Z
DTSTAMP:20260404T131158Z
UID:Sem21/1
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/Sem21
 /1/">Resurgence and renormalons in quantum field theory</a>\nby Marcos Mar
 ino (Geneva) as part of SEU Yau Center Theoretical Physics Seminars 2021\n
 \n\nAbstract\nPerturbation theory remains the most general approach to und
 erstanding generic quantum theories. However\, the series obtained in this
  way are usually divergent and need to be complemented by additional\, non
 -perturbative information. The theory of resurgence is a framework to make
  sense of divergent series by using resummation techniques and including n
 on-perturbative information in the form of “trans-series". In quantum me
 chanics\, many observables can be fully understood by using the theory of 
 resurgence\, but quantum field theories are more challenging. In realistic
  quantum field theories\, the main source of non-perturbative corrections 
 to the perturbative series are the so-called renormalons\, which remain my
 sterious objects. In this talk I will present the basics of the theory of 
 resurgence and some successful applications in quantum mechanics. I will t
 hen move to quantum field theories. In order to address the problems due t
 o renormalons\, I will focus on integrable\, asymptotically free theories 
 in two dimensions where one can make very explicit analysis. I will show i
 n concrete examples that observables can be computed by trans-series due t
 o renormalons\, and I will discuss more generally the virtues and limits o
 f the resurgent approach.\n
LOCATION:https://stable.researchseminars.org/talk/Sem21/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Zoltan Bajnok (Wigner Institute)
DTSTART:20211012T080000Z
DTEND:20211012T090000Z
DTSTAMP:20260404T131158Z
UID:Sem21/2
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/Sem21
 /2/">From perturbative to non-perturbative in the O(4) sigma model</a>\nby
  Zoltan Bajnok (Wigner Institute) as part of SEU Yau Center Theoretical Ph
 ysics Seminars 2021\n\n\nAbstract\nIs it possible to derive non-perturbati
 ve contributions in a quantum field theory knowing only the perturbative c
 oefficients? We answer this question affirmatively based on the careful an
 alysis of the integrable two dimensional O(4) sigma model. We investigate 
 its ground state energy in a magnetic field\, for which integrability prov
 ides an exact linear integral equation. By cleverly expanding this equatio
 n we could calculate a large number of very precise\, factorially growing 
 perturbative coefficients. By investigating their asymptotical behaviour o
 n the Borel plane we managed to reveal a nice resurgence structure leading
  to the first few exponentially suppressed non-perturbative terms of the a
 mbiguity free trans-series. We checked our results against the direct nume
 rical solution of the exact integral equation and find complete agreement.
  (based on 2011.12254 and 2011.09897)\n
LOCATION:https://stable.researchseminars.org/talk/Sem21/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cyril Closset (Birmingham)
DTSTART:20211019T080000Z
DTEND:20211019T090000Z
DTSTAMP:20260404T131158Z
UID:Sem21/3
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/Sem21
 /3/">The U-plane of rank-one 4d N=2 KK theories</a>\nby Cyril Closset (Bir
 mingham) as part of SEU Yau Center Theoretical Physics Seminars 2021\n\n\n
 Abstract\nI will revisit the Seiberg-Witten description of the Coulomb bra
 nch of rank-one 4d N=2 supersymmetric QFTs\, including aspects of the glob
 al symmetry\, from the point of view of rational elliptic surfaces. This w
 ill include\, in particular\, a detailed study of the 5d superconformal fi
 eld theories with E_n symmetry\, compactified on a circle. I will also ske
 tch how to derive BPS quivers from that perspective. Interesting modular p
 roperties of the SW geometries will play a key role.\n
LOCATION:https://stable.researchseminars.org/talk/Sem21/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yiming Chen (Princeton)
DTSTART:20211026T120000Z
DTEND:20211026T130000Z
DTSTAMP:20260404T131158Z
UID:Sem21/4
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/Sem21
 /4/">Aspects of the black hole/string transition</a>\nby Yiming Chen (Prin
 ceton) as part of SEU Yau Center Theoretical Physics Seminars 2021\n\nAbst
 ract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/Sem21/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:John Cardy (Berkeley)
DTSTART:20211109T010000Z
DTEND:20211109T020000Z
DTSTAMP:20260404T131158Z
UID:Sem21/5
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/Sem21
 /5/">A Physical Interpretation of the TTbar Deformation of 2d Field Theory
 </a>\nby John Cardy (Berkeley) as part of SEU Yau Center Theoretical Physi
 cs Seminars 2021\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/Sem21/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pietro Longhi (ETH)
DTSTART:20211102T090000Z
DTEND:20211102T100000Z
DTSTAMP:20260404T131158Z
UID:Sem21/6
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/Sem21
 /6/">Quivers\, affine symmetries and wall-crossing invariance</a>\nby Piet
 ro Longhi (ETH) as part of SEU Yau Center Theoretical Physics Seminars 202
 1\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/Sem21/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Shouvik Datta (CERN)
DTSTART:20211101T080000Z
DTEND:20211101T090000Z
DTSTAMP:20260404T131158Z
UID:Sem21/9
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/Sem21
 /9/">Operator growth in 2d CFTs</a>\nby Shouvik Datta (CERN) as part of SE
 U Yau Center Theoretical Physics Seminars 2021\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/Sem21/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fabio Apruzzi (AEC Bern)
DTSTART:20211116T070000Z
DTEND:20211116T080000Z
DTSTAMP:20260404T131158Z
UID:Sem21/11
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/Sem21
 /11/">2-groups in 5d and 6d theories</a>\nby Fabio Apruzzi (AEC Bern) as p
 art of SEU Yau Center Theoretical Physics Seminars 2021\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/Sem21/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hernán González (Adolfo Ibanez)
DTSTART:20211207T110000Z
DTEND:20211207T120000Z
DTSTAMP:20260404T131158Z
UID:Sem21/13
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/Sem21
 /13/">The structure of IR divergences in celestial gluon amplitudes</a>\nb
 y Hernán González (Adolfo Ibanez) as part of SEU Yau Center Theoretical 
 Physics Seminars 2021\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/Sem21/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Carlos Nunez (Swansea)
DTSTART:20220111T070000Z
DTEND:20220111T080000Z
DTSTAMP:20260404T131158Z
UID:Sem21/14
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/Sem21
 /14/">Aspects of gauge-strings duality</a>\nby Carlos Nunez (Swansea) as p
 art of SEU Yau Center Theoretical Physics Seminars 2021\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/Sem21/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Wei Song (YMSC Tsinghua)
DTSTART:20211208T070000Z
DTEND:20211208T080000Z
DTSTAMP:20260404T131158Z
UID:Sem21/15
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/Sem21
 /15/">A BMS-invariant free scalar model</a>\nby Wei Song (YMSC Tsinghua) a
 s part of SEU Yau Center Theoretical Physics Seminars 2021\n\nAbstract: TB
 A\n
LOCATION:https://stable.researchseminars.org/talk/Sem21/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gang Yang (ITP-CAS)
DTSTART:20220105T060000Z
DTEND:20220105T070000Z
DTSTAMP:20260404T131158Z
UID:Sem21/17
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/Sem21
 /17/">Color-kinematics duality and double-copy of form factors</a>\nby Gan
 g Yang (ITP-CAS) as part of SEU Yau Center Theoretical Physics Seminars 20
 21\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/Sem21/17/
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