Sjoerd (Viktor) Beentjes



I am a PhD student in algebraic geometry at the University of Edinburgh, working under the supervision of Arend Bayer. My second supervisor is Johan Martens.
After completing my Master's in Mathematical Physics at the University of Amsterdam, I started my PhD in Edinburgh in September 2014.
As such, I'm a member of the Geometry and Topology research group in the Hodge Institute.

My interest lie in complex algebraic geometry, studied through the looking glass of derived categories of (quasi-)coherent sheaves.
Lately, I have been thinking about applications of these methods to problems of curve-counting on Calabi-Yau threefolds.
This uses Joyce's motivic Hall algebra, a topic I have been interested in since my Master's thesis in geometric representation theory.

In the academic year 2015/2016 I have been co-organising the student-run Geometry Club together with fellow PhD student Igor Krylov.
As of September 2016, the Geometry club morphed into the Hodge Club, broadening its horizon.
Furthermore, I was one of the two PostGraduate representatives of the School of Mathematics at the University of Edinburgh.


Visiting address:

School of Mathematics
The University of Edinburgh
James Clerk Maxwell Building
The King's Buildings
Peter Guthrie Tait Road
Scotland, UK

My office is JCMB 6324.
My email address is Sjoerd.Beentjes at dot uk


This is a list of seminar talks that I will give or have given. If available, notes are linked.

15 March 2017 Deformations of schemes Working seminar on Deformation Theory, University of Edinburgh Notes
24 February 2017 Crepant Resolutions and Donaldson-Thomas invariants 2CinC: Cow and Calf in Cardiff, Cardiff University
8 December 2016 A Hall algebra approach to representations of quivers GEARS seminar, University of Edinburgh
22 April 2016 Hilbert schemes and what they're good for Geometry Club, University of Edinburgh
November 2015 The Auslander-Reiten quiver SMSTC Working Seminar on Finite Dimensional Algebras, University of Edinburgh
20 March 2015 Something, something moduli Geometry Club, University of Edinburgh
3 March 2015 Introduction to stacks, moduli of curves, and the Hodge bundle Working Seminar on the WZW model in conformal field theory, University of Edinburgh
27 February 2015 Classifying stuff in geometry, or: the joy of quivers and moduli PostGraduate Colloquium, University of Edinburgh
23 January 2015 An Introduction to Derived Categories Category Theory Seminar, University of Edinburgh

Conferences, seminars and workshops

This is a list of upcoming events where I can be found.

24 - 28 April 2017 Positivity in algebraic and complex geometry ICMS, Edinburgh, UK
8 - 13 April 2017 Spring Meeting on Algebraic Geometry IPM, Tehran, Iran

And this is a list of the schools, conferences, and workshops where I could have been found over the past years.

23 - 24 February 2017 2CinC: Cow and Calf in Cardiff Cardiff University, UK
9 - 13 January 2017 Workshop - Stability conditions, Donaldson-Thomas invariants and cluster varieties University of Sheffield, UK
19 - 24 September 2016 Non-commutative, derived and homotopical methods in geometry University of Antwerp, Belgium
1 - 19 August 2016 Advanced School and Workshop on Moduli Spaces, Mirror Symmetry and Enumerative Geometry ICTP, Trieste, Italy
20 - 24 June 2016 Workshop - Curves on surfaces and 3-folds EPFL, Lausanne, Switzerland
23 - 27 May 2016 School - Wall-crossing and quiver varieties EPFL, Lausanne, Switzerland
13 - 15 April 2016 British Algebraic Geometry (BrAG) 2 ICMS, University of Edinburgh, United Kingdom
12 - 13 April 2016 Derived Category Days Edinburgh (DeCaDE) University of Edinburgh, United Kingdom
29 March - 2 April 2016 Derived Categories: dimensions, Stability conditions, and Enhancements HCM, University of Bonn, Germany
22 February - 4 March 2016 School: Moduli of Curves CIMAT, Guanajuato, Mexico
23 - 27 November 2015 Oberwolfach Seminar: Derived Geometry MFO, Oberwolfach, Germany
30 August - 4 September 2015 Algebraic Stacks and Related Topics SFB, University of Mainz, Germany
3 - 14 August 2015 SMI summer course: Moduli Spaced and Derived Categories Palazzone di Cortona, Scuola Normale Superiore, Italy
22 - 26 June 2015 Rationality Problems in Algebraic Geometry CIME/CIRM course in Levico Terme, Italy
15 - 19 June 2015 VBAC 2015: Fourier-Mukai, 34 years on University of Warwick, United Kingdom
25 May - 5 June 2015 Algebraic Varieties and their Moduli CRM Ennio di Giorgi, Scuola Normale Superiore di Pisa, Italy
9 - 20 February 2015 Workshop Geometry from Stability Conditions University of Warwick, United Kingdom
22 - 24 September 2014 British Algebraic Geometry (BrAG) 1 ICMS, University of Edinburgh, United Kingdom
8 - 12 September 2014 Introductory School on Derived Categories University of Warwick, United Kingdom

At the University of Edinburgh, there are the weekly research and student-run seminars on geometry (EDGE, Hodge Club), algebra (Maximals, GEARS), and Category Theory.