BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Justin Kaidi (Simons Center\, Stony Brook) DTSTART:20201204T030000Z DTEND:20201204T040000Z DTSTAMP:20260423T052710Z UID:EASW/13 DESCRIPTION:Title: Ad ventures in Non-Supersymmetric String Theory\nby Justin Kaidi (Simons Center\, Stony Brook) as part of East Asian String Webinars\n\n\nAbstract\ nIt has long been known that there exist strings with supersymmetry on the world sheet\, but not in spacetime. These include the well-known Type 0 s trings\, as well as a series of seven heterotic strings\, all of which are obtained by imposing unconventional GSO projections. Besides these classi c examples though\, relatively little is known about the full space of non -SUSY theories. One of the reasons why non-SUSY strings have remained unde rstudied is the fact that nearly all of them have closed string tachyons\, and hence do not admit ten-dimensional flat space as a stable vacuum. The goal of this talk is two-fold. First\, using recent advances in condensed matter theory\, we will reinterpret GSO projections in terms of topologic al phases of matter\, thereby providing a framework for the classification of non-SUSY strings. Having done so\, we will show that for all non-SUSY theories in which a tachyon exists\, it can be condensed to give a stable lower-dimensional vacuum. In many cases\, these stable vacua will be two-d imensional string theories already known in the literature.\n LOCATION:https://researchseminars.org/talk/EASW/13/ END:VEVENT END:VCALENDAR