BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Jakob Moritz (Cornell) DTSTART:20210311T153000Z DTEND:20210311T163000Z DTSTAMP:20260423T010012Z UID:HEPTUW/19 DESCRIPTION:Title: Resolving spacetime singularities in flux compactifications and KKLT\n by Jakob Moritz (Cornell) as part of HEP seminars TU Wien (Vienna)\n\n\nAb stract\nI explain how string theory resolves ubiquitous singularities in t ype IIB flux compactifications (and eventually KKLT de Sitter vacua) via e ffects that are non-perturbative in the \\alpha' expansion of string theor y. I will show that these can be understood in detail by mapping them to w ell known gauge instanton effects in pure 4d N=2 Yang-Mills theory. A perh aps surprising consequence is that the naively 'elementary' D7 brane of ty pe IIB string theory is properly thought of as a bound state of two mutual ly non-local cosmic defects in six dimensions upon compactification on a c urved 4-manifold. Finally\, I will argue that the resolution described ind icates that KKLT de Sitter vacua can be controlled by a small flux superpo tential although the K\\"ahler potential may in general receive large corr ections which are difficult to compute.\n LOCATION:https://researchseminars.org/talk/HEPTUW/19/ END:VEVENT END:VCALENDAR