[Turkmath:6050] ODTU-Bilkent Algebraic Geometry Seminar-Zoom-526

[Ali Sinan Sertöz]

*Welcome to the 2023 Spring talks of ODTU-Bilkent Algebraic Geometry 
Seminars**
*
/since 2000/
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This week the ODTU-Bilkent Algebraic Geometry Seminar 
<http://www.bilkent.edu.tr/~sertoz/agseminar.htm>  is *online*

/This talk will begin at _*15:40*__ (GMT+3)_/
Please check your time difference between Ankara and your city here 
<https://www.timeanddate.com/worldclock/fixedtime.html?msg=ODT%C3%9C-Bilkent+Algebraic+Geometry+Seminar&iso=20230407T1540&p1=19>
*=================================================================*
**
/Edouard Leon Cortes (1882-1969)
/

**Speaker:Tolga Karayayla <https://avesis.metu.edu.tr/tkarayay>
****Affiliation: /ODTÜ/****
Title:On a class of non-simply connected Calabi-Yau 3-folds with 
positive Euler characteristic-Part 2

**
**Abstract:**
In this talk I will present a class of non-simply connected Calabi-Yau 
3-folds with positive Euler characteristic which are the quotient spaces 
of fixed-point-free group actions on desingularizations of singular 
Schoen 3-folds. A Schoen 3-fold is the fiber product of two rational 
elliptic surfaces with section. Smooth Schoen 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 automorphism groups 
of rational elliptic surfaces with section. The smooth Schoen 3-fold 
case gives 0 Euler characteristic whereas the singular case results in 
positive Euler characteristic for the quotient CY threefolds.

*Date:7 April 2023*, *Friday*
*Time: 15:40 /(GMT+3)/*
*Place: **Zoom*

    **One day before the seminar, an announcement with the Zoom meeting
    link will be sent to those who registered with Sertöz.
    **

    **If you have registered before for one of the previous talks, there
    is no need to register again; you will automatically receive a link
    for this talk too.
    **

    **If you have not registered before, please contact him at
    sertoz at bilkent.edu.tr
    <mailto:sertoz at bilkent.edu.tr?subject=Zoom%20Seminar%20Address%20Request>.**


You are most cordially invited to attend.

Ali Sinan Sertöz
/(PS: To unsubscribe from this list please send me a note.)/
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Ali Sinan Sertöz
Bilkent University, Department of Mathematics, 06800 Ankara, Türkiye
Office: (90)-(312) - 290 1490
Department: (90)-(312) - 266 4377
Fax: (90)-(312) - 290 1797
e-mail:sertoz at bilkent.edu.tr  <mailto:sertoz at bilkent.edu.tr>  
Web:sertoz.bilkent.edu.tr  <http://sertoz.bilkent.edu.tr>  
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