BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Jyotirmoy Barman (ICTS\, Bangalore) DTSTART:20260821T070000Z DTEND:20260821T080000Z DTSTAMP:20260824T002206Z UID:EUPAC-TP/41 DESCRIPTION:Title: Instanton-Induced Closed-String Amplitudes in Minimal Superstring Theory at Subleading Order\nby Jyotirmoy Barman (ICTS\, Bangalore) as part o f Europe and Pacific Theoretical Physics\n\n\nAbstract\nWe compute the dis k one-point function\, the disk two-point function\, and the annulus one-p oint\nfunction of the cosmological constant operator in the type 0A and ty pe 0B minimal superstring\ntheories with (1\,1) ZZ instanton boundary cond itions. The moduli-space integrals appearing in the\ndisk two-point functi on and the annulus one-point function have divergences associated with ope n-\nstring-channel degenerations\, which must be regulated using open-clos ed string field theory. The\ndefinition of the string field theory interac tion vertices requires a choice of locations for the picture-\nchanging op erators\, which we specify in detail. After carefully taking into account all contributions\,\nincluding those from vertical integration\, we find t hat the results precisely match the expectations\nfrom DDK-KPZ scaling. Ou r technical results on the detailed construction of interaction vertices\n are a first step toward understanding the analogous quantities in the ten- dimensional type IIB\nsuperstring\, where one also needs to understand how to treat the bosonic and fermionic collective\ncoordinates at subleading order.\n LOCATION:https://researchseminars.org/talk/EUPAC-TP/41/ END:VEVENT END:VCALENDAR