BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Hao Lan-Xu (Stony Brook University) DTSTART:20230921T183000Z DTEND:20230921T193000Z DTSTAMP:20260423T005744Z UID:nhetc/88 DESCRIPTION:Title: A nalyticity properties of 2d Ising Field Theories\nby Hao Lan-Xu (Stony Brook University) as part of NHETC Seminar\n\n\nAbstract\nIn this talk\, I will discuss the analyticity properties of 2d Ising field theories (IFTs ). I will start with a short introduction to 2d Ising field theory\, which is the continuous limit of the 2d Ising model on square lattice. Then the different spectrum scenarios for high-T and low-T domains will be introdu ced. Generally speaking\, an IFT which sits not at the critical temperatur e and has a non-vanishing external field is neither solvable nor integrabl e. However\, it's possible to look into the analytical properties of vario us quantities in the theory space\, then further non-perturbative informat ion can be extracted. I will focus on the analyticity properties for mass of the first excitation\, and discuss its critical behaviours and dispersi on relation in both ordered and disordered phase. Finally\, if time allowe d\, I will switch the topic and discuss the analyticity properties of the analytical structure of S-matrices\, and show various related interesting phenomenons together with unsolved questions.\n\nReferences:\n[1] Ising fi eld theory in a magnetic field: Analytic properties of the free energy\, P . Fonseca and A. Zamolodchikov\, hep-th/0112167 [hep-th].\n[2] Ising Spect roscopy II: Particles and poles at T > Tc\, A. Zamolodchikov\, 1310.4821 [ hep-th].\n[3] 2D Ising Field Theory in a magnetic field: the Yang-Lee sing ularity\, H. Xu and A. Zamolodchikov\, 2203.11262 [hep-th].\n[4] On the S- matrix of Ising field theory in two dimensions\, B. Gabai and X. Yin\, 190 5.00710 [hep-th]\n[5] Ising Field Theory in a Magnetic Field: Extended ana lyticity properties of M1\, H. Xu\, in preparation.\n LOCATION:https://researchseminars.org/talk/nhetc/88/ END:VEVENT END:VCALENDAR