BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Alexander Degtyarev (Bilkent) DTSTART:20220311T124000Z DTEND:20220311T134000Z DTSTAMP:20260423T021110Z UID:OBAGS/2 DESCRIPTION:Title: To wards 800 conics on a smooth quartic surfaces\nby Alexander Degtyarev (Bilkent) as part of ODTU-Bilkent Algebraic Geometry Seminars\n\n\nAbstrac t\nThis will be a technical talk where I will discuss a few computational aspects of my work in progress towards the following conjecture.\n\nConjec ture: A smooth quartic surface in P3 may contain at most 800 conics.\n\nI will suggest and compare several arithmetical reductions of the problem. T hen\, for the chosen one\, I will discuss a few preliminary combinatorial bounds and some techniques used to handle the few cases where those bounds are not sufficient.\n\nAt the moment\, I am quite confident that the conj ecture holds. However\, I am trying to find all smooth quartics containing 720 or more conics\, in the hope to find the real quartic maximizing the number of real lines and to settle yet another conjecture (recall that we count all conics\, both irreducible and reducible).\n\nConjecture: If a s mooth quartic X⊂P3 contains more than 720 conics\, then X has no lines\; in particular\, all conics are irreducible.\n\nCurrently\, similar bounds are known only for sextic K3-surfaces in P4.\n\nAs a by-product\, I have found a few examples of large configurations of conics that are not Barth- -Bauer\, i.e.\, do not contain\na 16-tuple of pairwise disjoint conics or\ , equivalently\, are not Kummer surfaces with all 16 Kummer divisors conic s.\n LOCATION:https://researchseminars.org/talk/OBAGS/2/ END:VEVENT END:VCALENDAR