BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Yue-Zhou Li (Princeton University) DTSTART:20241016T140000Z DTEND:20241016T150000Z DTSTAMP:20260423T021126Z UID:AnLy/45 DESCRIPTION:Title: A universal cutoff for field theory with gravity\nby Yue-Zhou Li (Prince ton University) as part of AnLy Strings and Fields online seminars\n\n\nAb stract\nThere is a longstanding argument that local field theory with grav ity must break down at the species scale\, which is much lower than the Pl anck scale by the number of species. We aim to improve the understanding o f this statement. We analyze the one-loop effects of massive fields on the graviton scattering and the analyticity and unitarity allows us to put nu merical bounds on the number of light species. Around the scale where the field theory breaks down\, we instead analyze the partial waves and observ e that possible UV scenarios with gravity\, such as string theory\, all ex hibit significant high-spin contents. This motivates a concept "high-spin onset scale"\, which qualitatively coincides with string scale or higher d imensional Plank scale\, depending on the UV scenarios. The suggestion is that the high-spin onset scale is a universal cutoff for field theory\, be yond which the local field description should not exist.\n LOCATION:https://researchseminars.org/talk/AnLy/45/ END:VEVENT END:VCALENDAR