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SUMMARY:Tolga Karayayla (ODTÜ)
DTSTART:20230331T124000Z
DTEND:20230331T134000Z
DTSTAMP:20260423T021248Z
UID:OBAGS/23
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/OBAGS/23/">O
 n a class of non-simply connected Calabi-Yau 3-folds with positive Euler c
 haracteristic-Part 1</a>\nby Tolga Karayayla (ODTÜ) as part of ODTU-Bilke
 nt Algebraic Geometry Seminars\n\n\nAbstract\nIn this talk I will present 
 a class of non-simply connected Calabi-Yau 3-folds with positive Euler cha
 racteristic which are the quotient spaces of fixed-point-free group action
 s on desingularizations of singular Schoen 3-folds. A Schoen 3-fold is the
  fiber product of two rational elliptic surfaces with section. Smooth Scho
 en 3-folds are simply connected CY 3-folds. Desingularizations of certain 
 singular Schoen 3-folds by small resolutions have the same property. If a 
 finite group G acts freely on such a 3-fold\, the quotient is again a CY 3
 -fold. I will present how to classify such group actions using the automor
 phism groups of rational elliptic surfaces with section. The smooth Schoen
  3-fold case gives 0 Euler characteristic whereas the singular case result
 s in positive Euler characteristic for the quotient CY threefolds.\n
LOCATION:https://researchseminars.org/talk/OBAGS/23/
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