BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Simone Diverio (SAPIENZA Università di Roma) DTSTART:20210205T160000Z DTEND:20210205T171500Z DTSTAMP:20260423T005712Z UID:CIRGET/28 DESCRIPTION:Title: Pointwise universal Gysin formulae and positivity of some characteristic f orms\nby Simone Diverio (SAPIENZA Università di Roma) as part of CRM - Séminaire du CIRGET / Géométrie et Topologie\n\n\nAbstract\nIn the la st few years there has been a renewed interest around an old conjecture by Griffiths characterizing which should be the positive characteristic form s for any given Griffiths positive holomorphic Hermitian vector bundle. Ac cording to this conjecture\, they should be precisely the characteristic f orms belonging to the positive cone spanned by the Schur forms.\nAfter rec alling the various notions of positivity for holomorphic Hermitian vector bundles\, and how they are (or should be) related\, we shall explain a rec ent result obtained in collaboration with my PhD student F. Fagioli\, whic h gives a partial confirmation of the above conjecture.\nSuch a result is obtained as a consequence of a pointwise\, differential-geometric Gysin fo rmula for the push-forward of the curvature of the tautological line bundl es over flag bundles.\n LOCATION:https://researchseminars.org/talk/CIRGET/28/ END:VEVENT END:VCALENDAR