BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Stefano Negro (NYU) DTSTART:20230328T183000Z DTEND:20230328T193000Z DTSTAMP:20260423T005743Z UID:nhetc/81 DESCRIPTION:Title: T he relevance of being irrelevant\nby Stefano Negro (NYU) as part of NH ETC Seminar\n\n\nAbstract\nIn the last few years\, 2-dimensional Quantum F ield Theories deformed by irrelevant operators have been receiving a stead ily growing amount of attention from the Theoretical Physics community. Th e main reason for this interest lies in the unexpected amount of control t hat it is possible to exert on the high-energy properties of a vast family of these deformations. These\, often referred to as “solvable irrelevan t deformations”\, in spite of being by standard arguments non-renormalis able\, allow us to follow the irrelevant flow all the way to the UV and to obtain exact results on the high-energy physics. The latter are remarkabl e: the finite-size density of states grows exponentially at high energies\ , in a Hagedorn fashion reminiscent of String Theories. These deformed the ories are not compatible with Wilson’s paradigm of local QFTs and cannot be considered conventional UV-complete theories. However\, thanks to thei r robust features\, they represent a sensible extension of the Wilsonian n otion of a local QFT.\n\nI will recall the main features of the TTbar defo rmations\, the poster child of solvable irrelevant deformations\, in an in troductory manner. If time permits I will then describe the more recent de velopments for a vast class of irrelevant deformations of 2D Integrable QF Ts\, paying particular attention to their interpretation as factorised sca ttering theories. This perspective reveals the importance of these theorie s in the task undertaken by the Bootstrap community of mapping out the spa ce of consistent scattering matrices.\n LOCATION:https://researchseminars.org/talk/nhetc/81/ END:VEVENT END:VCALENDAR