BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Stefan Weinzierl (Mainz) DTSTART:20200930T150000Z DTEND:20200930T160000Z DTSTAMP:20260404T111006Z UID:TCDcolloquium/9 DESCRIPTION:Title: Feynman integrals associated to elliptic curves\nby Stefa n Weinzierl (Mainz) as part of Dublin Theoretical Physics Colloquium\n\n\n Abstract\nFeynman integrals are indispensable for precision calculations i n quantum field theory. But they are notoriously difficult to calculate. W hile we do have methods to compute any one-loop Feynman integral analytica lly\, already at two-loops there are Feynman integrals for which the known methods fail. The first obstruction one encounters is related to elliptic curves\, and for this reason the Feynman integrals not tractable by stand ard methods are known as ``elliptic’’ Feynman integrals. In this talk I will review our current knowledge about Feynman integrals associated to elliptic curves.\n LOCATION:https://stable.researchseminars.org/talk/TCDcolloquium/9/ END:VEVENT BEGIN:VEVENT SUMMARY:Edgar Shaghoulian (Cornell) DTSTART:20201007T150000Z DTEND:20201007T160000Z DTSTAMP:20260404T111006Z UID:TCDcolloquium/10 DESCRIPTION:Title: Looking for islands\nby Edgar Shaghoulian (Cornell) as p art of Dublin Theoretical Physics Colloquium\n\n\nAbstract\nI will review the role of replica wormholes in deriving a unitary Page curve for Hawking radiation and discuss extensions to flat spacetime and cosmology. I will also discuss general consistency conditions that guide the search for such nontrivial saddles in the gravitational path integral.\n LOCATION:https://stable.researchseminars.org/talk/TCDcolloquium/10/ END:VEVENT BEGIN:VEVENT SUMMARY:Marco Serone (SISSA) DTSTART:20201014T150000Z DTEND:20201014T160000Z DTSTAMP:20260404T111006Z UID:TCDcolloquium/11 DESCRIPTION:Title: Conformal windows and walking dynamics in four-dimensional g auge theories\nby Marco Serone (SISSA) as part of Dublin Theoretical P hysics Colloquium\n\n\nAbstract\nFour-dimensional gauge theories can flow in the infrared to non-trivial conformal field theories. At large N the RG flow can be under perturbative control and in presence of scalar matter c an admit more than one fixed point. We show a specific model of this kind where conformality can be lost due to the merging of two nearby fixed poin ts that move into the complex plane\, and gives rise to a walking dynamics . In the more interesting case of pure fermion matter\, such as QCD with a n arbitrary number $n_f$ of fundamental flavours\,\nonly one fixed point c an be perturbatively under control and the extension of the conformal wind ow is debated. Using Borel resummation techniques we provide evidence that QCD with $n_f=12$ is conformal and indications that the conformal window extends to lower values of $n_f$.\nA possible walking regime can occur for $n_f<12$\, but in a regime where our methods break down.\n LOCATION:https://stable.researchseminars.org/talk/TCDcolloquium/11/ END:VEVENT BEGIN:VEVENT SUMMARY:Alex Maloney (McGill) DTSTART:20201021T150000Z DTEND:20201021T160000Z DTSTAMP:20260404T111006Z UID:TCDcolloquium/12 DESCRIPTION:Title: Gravity from Averaging CFTs\nby Alex Maloney (McGill) as part of Dublin Theoretical Physics Colloquium\n\n\nAbstract\nI will explo re the idea that certain theories of gravity in Anti-de-Sitter space are d ual to an average over an ensemble of quantum theories\, rather than to a specific quantum theory. I will describe an average over Narain’s famil y of two-dimensional conformal field theories which describe free bosons o n a torus\, and compute the partition function using the Siegel-Weil formu la. The result takes the form of a sum over geometries as one would expec t in a theory of gravity. But the gravitational theory looks more like a Chern-Simons theory than like Einstein gravity.\n LOCATION:https://stable.researchseminars.org/talk/TCDcolloquium/12/ END:VEVENT BEGIN:VEVENT SUMMARY:Liam Fitzpatrick (Boston) DTSTART:20201028T160000Z DTEND:20201028T170000Z DTSTAMP:20260404T111006Z UID:TCDcolloquium/13 DESCRIPTION:by Liam Fitzpatrick (Boston) as part of Dublin Theoretical Phy sics Colloquium\n\nAbstract: TBA\n LOCATION:https://stable.researchseminars.org/talk/TCDcolloquium/13/ END:VEVENT BEGIN:VEVENT SUMMARY:Paolo Di Vecchia (Nordita) DTSTART:20201111T160000Z DTEND:20201111T170000Z DTSTAMP:20260404T111006Z UID:TCDcolloquium/14 DESCRIPTION:Title: Universality of ultra-relativistic gravitational scattering< /a>\nby Paolo Di Vecchia (Nordita) as part of Dublin Theoretical Physics C olloquium\n\nAbstract: TBA\n LOCATION:https://stable.researchseminars.org/talk/TCDcolloquium/14/ END:VEVENT BEGIN:VEVENT SUMMARY:Benjamin Basso (ENS) DTSTART:20201202T160000Z DTEND:20201202T170000Z DTSTAMP:20260404T111006Z UID:TCDcolloquium/15 DESCRIPTION:Title: Dressing up the pair of pants in planar N=4 SYM\nby Benj amin Basso (ENS) as part of Dublin Theoretical Physics Colloquium\n\n\nAbs tract\nI will discuss the wrapping problem for structure constants of sing le-trace operators in planar N=4 SYM in the integrability-based hexagon fo rmalism. In this approach a three-point function represented as a pair of pants is cut into smaller pieces - the hexagons - which are then stitched back together. The gluing procedure which is an important part of the prog ram has passed many tests but suffers from so-called wrapping divergences when applied to short-length operators. In this talk I will explain how to fix this problem to leading order for a class of structure constants usin g an analogy with thermal correlation functions. Besides shedding light on the thermal-like structures dressing the hexagon formula\, the solution p redicts that new cubic structures must be added to the mix. The latter are specific to the pair-of-pants geometry and help resolving a few tensions between the hexagon predictions and known perturbative gauge / string theo ry results.\n LOCATION:https://stable.researchseminars.org/talk/TCDcolloquium/15/ END:VEVENT BEGIN:VEVENT SUMMARY:Michael Smolkin (Jerusalem) DTSTART:20201104T160000Z DTEND:20201104T170000Z DTSTAMP:20260404T111006Z UID:TCDcolloquium/16 DESCRIPTION:by Michael Smolkin (Jerusalem) as part of Dublin Theoretical P hysics Colloquium\n\nAbstract: TBA\n LOCATION:https://stable.researchseminars.org/talk/TCDcolloquium/16/ END:VEVENT BEGIN:VEVENT SUMMARY:Gregory Korchemsky (Saclay) DTSTART:20201118T160000Z DTEND:20201118T170000Z DTSTAMP:20260404T111006Z UID:TCDcolloquium/17 DESCRIPTION:Title: Solving AdS/CFT with strong Szego limit theorem\nby Greg ory Korchemsky (Saclay) as part of Dublin Theoretical Physics Colloquium\n \n\nAbstract\nI will report on a recent progress in computing four-point c orrelation functions of infinitely heavy half-BPS operators in planar N = 4 SYM. Taking advantage of integrability of the theory\, these correlation functions can be constructed in terms of fundamental building blocks - th e octagon form factors. We show that these functions can be expressed as F redholm determinants of the integrable Bessel operator and demonstrate tha t this representation is very efficient in finding the dependence of the o ctagons on the ’t Hooft coupling and two cross ratios. At weak coupling\ , this yields a known series representation of the octagon in terms of lad der integrals. At strong coupling\, we apply strong Szego limit theorem to develop a systematic expansion of the octagon in the inverse powers of th e coupling constant and calculate accompanying expansion coefficients anal ytically.\n LOCATION:https://stable.researchseminars.org/talk/TCDcolloquium/17/ END:VEVENT BEGIN:VEVENT SUMMARY:Shota Komatsu (CERN) DTSTART:20201125T160000Z DTEND:20201125T170000Z DTSTAMP:20260404T111006Z UID:TCDcolloquium/18 DESCRIPTION:Title: Wilson Loop and Matrix Product States in Maximally Supersymm etric Yang-Mills\nby Shota Komatsu (CERN) as part of Dublin Theoretica l Physics Colloquium\n\n\nAbstract\nOver the last fifteen years\, there ha ve been significant developments in computing correlation functions of loc al operators in the maximally supersymmetric Yang-Mills theory in four dim ensions. What triggered this burst of activity was the finding by Minahan and Zarembo that local operators in this theory can be mapped to states in an integrable spin chain. In this talk\, I will show that this correspond ence can be extended to Wilson loops in a rather nontrivial way: the Wilso n loops in this theory can be mapped to Matrix Product States in the same spin chain system. I will explain this new relation and use it to compute the correlation function of the Wilson loop and a local operator.\n LOCATION:https://stable.researchseminars.org/talk/TCDcolloquium/18/ END:VEVENT BEGIN:VEVENT SUMMARY:Kyle Parfrey (TCD) DTSTART:20201209T160000Z DTEND:20201209T170000Z DTSTAMP:20260404T111006Z UID:TCDcolloquium/19 DESCRIPTION:Title: A Tour of Computational Approaches in Relativistic Astrophys ical Plasma Simulation\nby Kyle Parfrey (TCD) as part of Dublin Theore tical Physics Colloquium\n\n\nAbstract\nThe magnetised plasmas surrounding black holes and neutron stars are responsible for a great variety of biza rre astronomical phenomena\, from relativistic radio jets to giant gamma-r ay flares. Understanding this behaviour via numerical simulation requires a range of specialised methods\, dictated by the unusual physical conditio ns. I'll briefly introduce these two families of compact relativistic obje cts and describe some ways in which recent computational research has both confirmed decades-old proposals and yielded a few surprises. I'll finish by describing ongoing work aiming to produce a simulation code that is use ful for both high-energy astrophysics and whole-device fusion-plasma model ling.\n LOCATION:https://stable.researchseminars.org/talk/TCDcolloquium/19/ END:VEVENT BEGIN:VEVENT SUMMARY:Andrea Puhm (Ecole Polytechnique\, CPHT) DTSTART:20210407T150000Z DTEND:20210407T160000Z DTSTAMP:20260404T111006Z UID:TCDcolloquium/20 DESCRIPTION:Title: Celestial Diamonds\nby Andrea Puhm (Ecole Polytechnique\ , CPHT) as part of Dublin Theoretical Physics Colloquium\n\n\nAbstract\nCe lestial holography asserts that the quantum gravity S-matrix in asymptotic ally flat space is dual to a codimension two conformal field theory living on the celestial sphere. To understand the nature of the holographic map I will focus on the celestial building blocks given by conformal primary w avefunctions which are boost rather than energy eigenstates and whose nove l generalization captures ultra-boosted black holes\, shockwaves and other interesting bulk metrics. Examining the structure of global conformal mul tiplets in 2D celestial CFT reveals the power of symmetry to organize soca lled conformally soft behavior and ties together questions about the vacuu m structure of asymptotically flat spacetimes\, constraints on celestial a mplitudes\, and intrinsically 2D effective descriptions of celestial CFT. We refer to the nested structure of primary descendants as ‘celestial di amonds’ and show that their corners are related to the factorization the orems of celestial correlators\, soft charges for spontaneously broken asy mptotic symmetries and conformal dressings for amplitudes.\n LOCATION:https://stable.researchseminars.org/talk/TCDcolloquium/20/ END:VEVENT END:VCALENDAR