BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Cliff Burgess (Department of Physics & Astronomy\, McMaster Univer sity and Perimeter Institute for Theoretical Physics (PITP)\, Canada) DTSTART:20200716T133000Z DTEND:20200716T160000Z DTSTAMP:20260423T010810Z UID:QASTM/21 DESCRIPTION:Title: S caling the Landscape: Robust EFT Implications from UV Physics\nby Clif f Burgess (Department of Physics & Astronomy\, McMaster University and Per imeter Institute for Theoretical Physics (PITP)\, Canada) as part of Quant um Aspects of Space-Time and Matter\n\n\nAbstract\nThe phenomenon of decou pling is a two-edged sword: it allows a robust understanding of low-energy physics without requiring detailed knowledge of UV completions\, but by d oing so it also hides any clues about these completions from prying low-en ergy eyes. There is widespread interest in finding any UV diamonds amongst the low-energy roughage\, however\, as is illustrated by the `swampland ’ program. This program promotes the perceived difficulties in finding p henomenologically successful mechanisms (eg cosmic inflation) in string th eory into a principle\, by asserting that some low-energy theories do not have UV completions\, so the UV information lies in what can and cannot be completed. This talk takes a different approach\, arguing that EFTs comin g from weakly coupled strings enjoy a pattern of approximate scaling symme tries\, and it is these symmetries and their pattern of breaking that prov ide the robust UV information that is accessible at low energies. We argue that these symmetries (together with other low-energy symmetries) account for the widespread occurrence of no-scale supergravities in 4D string vac ua\, and encode attractive new mechanisms for technical naturalness. In pa rticular\, the symmetries themselves account for the rarity of (but do not predict the absence of) inflationary vacua\, and the models to which they point include an enormously successful class of technically natural infla tionary models (not based on axions) that come with potentially testable i mplications for the search for primordial gravity waves.\n LOCATION:https://researchseminars.org/talk/QASTM/21/ END:VEVENT END:VCALENDAR