BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Simone Fabbri (SISSA) DTSTART:20260317T130000Z DTEND:20260317T150000Z DTSTAMP:20260423T004038Z UID:PSMQFT/8 DESCRIPTION:Title: N on-perturbative renormalization for lattice massive QED2: the ultraviolet problem\nby Simone Fabbri (SISSA) as part of Probability\, Statistical Mechanics and Quantum Fields\n\n\nAbstract\nI will consider a lattice reg ularization of the massive QED in 2d\, describing a Dirac fermion interact ing with a massive vector field\, in the regime in which the fermion mass is much smaller than the boson mass and the latter is much smaller than th e ultraviolet cut-off\, which is the suitable one to mimic a realistic 4d massive gauge theory like the Electroweak sector. The presence of the latt ice and of non-zero fermion mass breaks any solvability property. I will s how that the effective action obtained after the integration of the ultrav iolet degrees of freedom is expressed by expansions which are convergent f or values of the coupling (electric charge) independent on the fermion mas s and the ultraviolet cut-off\, and with cut-off-independent bare paramete rs. By combining this result with the analysis of the infrared part in pre vious papers we get a complete construction of the model and a number of p roperties whose analogous are expected to hold in 4d. As I will discuss\, the choice of lattice rather than momentum regularization\, essential for ensuring Ward Identities\, requires the development of new methods to get the necessary non-perturbative bounds. \nBased on a recent joint work with V. Mastropietro (Roma La Sapienza) and B. Renzi (SISSA).\n LOCATION:https://researchseminars.org/talk/PSMQFT/8/ END:VEVENT END:VCALENDAR