The Unreasonable Effectiveness of Toric Geometry: Bridging Mathematics, Computation, and String Theory

Toric geometry provides a versatile and powerful way of describing large classes of algebraic varieties in terms of simple diagrams (polytopes or fans) in integer lattices. Due to the explicit nature of the data involved, many questions can be addressed with the help of computers. The possibility of describing large numbers of compact and non-compact Calabi-Yau spaces, and a close connection with the gauged linear sigma model, make toric geometry an important tool in the compactification of string theory. 

This programme aims to create a stimulating environment where mathematicians working in string inspired areas of toric geometry meet physicists who use toric geometry as a tool. Recent developments will be discussed over the disciplinary border, thereby facilitating progress on open problems and the formulation of new questions.

Topics

  • Toric geometry as an arena for explorations in string theory, where a wide range of questions in physics can be tested with precise mathematical tools.
     
  • String theory as an abundant source of intriguing mathematical questions.
     
  • Specialist software for research in theoretical physics and mathematics (e.g. Macaulay2 and cytools) and machine learning tools for addressing open questions (e.g. ML libraries for Calabi-Yau metrics).

General structure of the programme

Weeks 1 (June 15 – July 3): Mainly overview and introductory lectures (roughly two per day).

Week 4 (July 6 – July 10): Workshop week focused on recent results (several 45-minute talks per day).

Weeks 5 (July 13 – July 17): Further lectures (approximately two per day).

For a detailed schedule, see above.

June 15, 2026
09:00 — 12:00
Registration and informal meetings

Please register with the staff in the secretariat, and meet and greet the other participants in the lounge.

12:00 — 13:50
Lunch break
13:50 — 15:00
Amihay Hanany (Imperial College London)
Brane Tilings and Toric Geometry
Recording

Introductory keynote lecture (preceded by opening remarks)

15:00 — 15:30
Coffee break
June 16, 2026
09:30 — 10:30
Victor Batyrev (U Tübingen)
Mirror Symmetry and Combinatorial Dualities
Recording

Introductory keynote lecture

10:30 — 11:00
Coffee break
11:00 — 12:00
Informal meetings
12:00 — 14:00
Lunch break
15:00 — 15:30
Coffee break
15:30 — 16:30
Michael E. Stillman (Cornell U, Ithaca)
Introducing Macaulay2
June 17, 2026
09:00 — 14:00
No events scheduled

But the ESI is open to you!

15:00 — 15:30
Coffee break
15:30 — 16:30
Nate MacFadden (Cornell U, Ithaca)
Calabi-Yau Power Tools: a demo, Lecture 1
June 18, 2026
09:30 — 10:30
Johanna Knapp (U Melbourne)
Introduction to PALP
Recording Slides

part 1 of a 2-part course with Emanuel Scheidegger

10:30 — 11:00
Coffee break
11:00 — 12:00
Informal meetings
12:00 — 14:00
Lunch break
15:00 — 15:30
Coffee break
15:30 — 16:30
Nate MacFadden (Cornell U, Ithaca)
Calabi-Yau Power Tools: a demo, Lecture 2
June 19, 2026
09:30 — 10:30
Emanuel Scheidegger (Peking U)
Introduction to PALP
Recording Slides

part 2 of a 2-part course with Johanna Knapp

10:30 — 11:00
Coffee break
12:00 — 17:00
No events scheduled

But the ESI is open to you!

June 22, 2026
09:00 — 12:00
Registration and informal meetings

Newcomers: please register with the staff in the secretariat. Everyone: meet and greet the other participants in the lounge. If you want to join the dinner on Thursday and have not yet registered, do so before 12:00.

12:00 — 14:00
Lunch break
14:00 — 15:00
15:00 — 15:30
Coffee break
15:30 — 16:30
June 23, 2026
09:30 — 10:30
Recording

part 1 of a 2-part course with Xenia de la Ossa

10:30 — 11:00
Coffee break
11:00 — 12:00
Informal meetings
12:00 — 14:00
Lunch break
14:00 — 15:00
15:00 — 15:30
Coffee break
15:30 — 16:30
June 24, 2026
09:30 — 10:30
Recording Slides

part of a 2-part course with Philip Candelas

10:30 — 11:00
Coffee break
11:00 — 12:00
Informal meetings
12:00 — 14:00
Lunch break
14:00 — 15:00
15:00 — 15:30
Coffee break
15:30 — 16:30
Informal meetings
June 25, 2026
09:30 — 10:30
Discussion session

The future of our fields with machine learning and AI (moderated by Magdalena Larfors)

10:30 — 11:00
Coffee break
11:00 — 12:00
Informal meetings
12:00 — 14:00
Lunch break
14:00 — 15:00
Gregory Smith (Queen's U, Kingston)
Toric basics: sheaves and cohomology
15:00 — 15:30
Coffee break
15:30 — 16:30
Informal meetings
18:30 — 23:00
Social dinner

Weinhof Zimmermann, Mitterwurzergasse 20, 1190 Wien, www.weinhof-zimmermann.at

Deadline for registration: Monday, June 22, 12:00 a.m

June 26, 2026
09:30 — 10:30
Gregory Smith (Queen's U, Kingston)
Toric basics: subvarieties and ideals
10:30 — 11:00
Coffee break
11:00 — 17:00
No events scheduled

But the ESI is open to you!

June 29, 2026
09:00 — 12:00
Registration and informal meetings

Newcomers: please register with the staff in the secretariat. Everyone: meet and greet the other participants in the lounge.

12:00 — 14:00
Lunch break
15:00 — 15:30
Coffee break
June 30, 2026
10:30 — 11:00
Coffee break
12:00 — 17:00
No events scheduled

But the ESI is open to you!

July 1, 2026
10:30 — 11:00
Coffee break
12:00 — 17:00
No events scheduled

But the ESI is open to you!

July 2, 2026
10:30 — 11:00
Coffee break
11:00 — 17:00
No events scheduled

But the ESI is open to you!

July 3, 2026
09:00 — 17:00
No events scheduled

But the ESI is open to you!

July 6, 2026
09:00 — 09:30
Registration & Welcome
10:15 — 10:45
Coffee Break

If you want to join the dinner on Thursday and have not yet registered, do so before 12:00.

12:15 — 14:00
Lunch Break
14:00 — 14:45
14:45 — 15:30
15:30 — 16:00
Coffee Break
16:00 — 16:45

Cancelled due to speaker's illness

July 7, 2026
09:30 — 10:15
10:15 — 10:45
Coffee Break
12:15 — 14:00
Lunch Break
14:00 — 14:45
14:45 — 15:30
15:30 — 16:00
Coffee Break
July 8, 2026
09:30 — 10:15
Abhiram Kidambi (MPI MIS, Leipzig)
Toric Geometry of Multiple Zeta Values
10:15 — 10:45
Coffee Break
10:45 — 11:30
Emanuel Scheidegger (Peking U)
On genus-one fibered Calabi-Yau threefolds
12:15 — 17:00
No events scheduled

But the ESI is open to you!

July 9, 2026
09:30 — 10:15
10:15 — 10:45
Coffee Break
11:30 — 12:15
12:15 — 14:00
Lunch Break
14:00 — 14:45
15:30 — 16:00
Coffee Break
18:30 — 23:00
Social dinner

Heuriger Feuerwehr Wagner, Grinzinger Straße 53, 1190 Wien, +43 1 320 24 42, www.feuerwehrwagner.at

Deadline for registration: Monday, July 6, 12:00 noon

July 10, 2026
09:30 — 10:15
Simon Telen (MPI MIS, Leipzig)
Positive charts of toric varieties
10:15 — 10:45
Coffee Break
10:45 — 11:30
11:30 — 12:15
12:15 — 17:00
No events scheduled

But the ESI is open to you!

July 13, 2026
09:00 — 09:30
Registration

Newcomers: please register with the staff in the secretariat

10:30 — 11:00
Coffee break
11:00 — 12:00
Informal meetings
12:00 — 14:00
Lunch break
14:00 — 15:00
15:00 — 15:30
Coffee break
15:30 — 16:30
Informal meetings
July 14, 2026
09:30 — 10:30
10:30 — 11:00
Coffee break
11:00 — 12:00
Informal meetings
12:00 — 14:00
Lunch break
14:00 — 15:00
15:00 — 15:30
Coffee break
15:30 — 16:30
Informal meetings
July 15, 2026
09:30 — 10:30
10:30 — 11:00
Coffee break
11:00 — 12:00
12:00 — 17:00
No events scheduled

But the ESI is open to you!

July 16, 2026
09:30 — 10:30
10:30 — 11:00
Coffee break
11:00 — 12:00
12:00 — 14:00
Lunch break
15:00 — 15:30
Coffee break
15:30 — 16:30
Informal meetings
July 17, 2026
09:00 — 17:00
No events scheduled

But the ESI is open to you!

This event has no subevents associated to it.

Organizers

Name Affiliation
Magdalena Larfors Uppsala University
Gary Shiu University of Wisconsin-Madison
Harald Skarke Vienna University of Technology
Michael E. Stillman Cornell University

Attendees

Name Affiliation
Paul Aspinwall Duke University
Victor Batyrev University of Tübingen
Callum Bell Lancaster University
Lev Borisov Rutgers University
Andreas Braun Durham University
Nana Geraldine Cabo Bizet University of Guanajuato
Philip Candelas University of Oxford
Federico Carta INFN (Sezione di Bologna)
Andrei Constantin University of Oxford
Mirjam Cvetič University of Pennsylvania
Xenia de la Ossa University of Oxford
Anamaria Font Central University of Venezuela
Xin Gao Sichuan University
Marco Ghirlanda University of Tübingen
Antonella Grassi University of Bologna
James Gray Virginia Polytechnic Institute and State University
Mark Gross University of Cambridge
Christian Haase Free University Berlin
Yuta Hamada KEK Theory Center, Tsukuba
Amihay Hanany Imperial College London
Bjoern Hassfeld University of Wisconsin Madison
Yacoub Hendi Uppsala University
Manfred Herbst TU Wien
Elli Heyes Imperial College London
Tara Holm Cornell University
Tristan Hübsch Howard University
Nathan Ilten Simon Fraser University
Vishnu Jejjala University of Witwatersrand
Elana Kalashnikov University of Waterloo
Sheldon Katz University of Illinois at Urbana-Champaign
Abhiram Kidambi Max Planck Institute for Mathematics in the Sciences, Leipzig
Hee-Cheol Kim Pohang University of Science and Technology
Johanna Knapp University of Melbourne
Seung-Joo Lee Yonsei University
Darren Lei University of Birmingham
Lucas Tsun Yin Leung University of Oxford
Fabián Levicán-Santibáñez University of Vienna
Guglielmo Lockhart Universität Bonn
Andre Lukas University of Oxford
Nate MacFadden Cornell University
Chris Manon University of Kentucky
Joseph McGovern Peking University
Alessandro Mininno University of Wisconsin Madison
Mario Montes Vienna University of Technology
Jakob Moritz University of Wisconsin-Madison
Luca Nutricati University of Oxford
Paul-Konstantin Oehlmann Uppsala University
Isabel Pearson University of Birmingham
Michael Perlman University of Alabama
Anton Rebhan Vienna University of Technology
Miles Reid University of Warwick
Fabian Ruehle Northeastern University
Andreas Schachner Cornell University
Emanuel Scheidegger Peking University
Hal Schenck Auburn University
Thorsten Schimannek Utrecht University
Maria Schimpf Vienna University of Technology
Friedrich Schöller TU Wien
Rak-Kyeong Seong Ulsan National Institute of Science and Technology
Elijah Sheridan Cornell University
Pramod Kumar Shukla Bose Institute, Unified Academic Campus (UAC)
Gregory Smith Queen's University
Marcus Sperling Universität Wien
Michael Stepniczka Cornell University
Balazs Szendroi University of Vienna
Simon Telen Max Planck Institute for Mathematics in the Sciences, Leipzig
Stefan Theisen Albert-Einstein-Institute
Moritz Walden Uppsala University
David Wu Harvard University
Matthias Zach University of Kaiserslautern-Landau
Preview of Amihay Hanany - Brane Tilings and Toric Geometry
Amihay Hanany (Imperial College London): Brane Tilings and Toric Geometry
June 15, 2026 13:50 — 15:00
Preview of Victor Batyrev - Mirror Symmetry and Combinatorial Dualities
Victor Batyrev (U Tübingen): Mirror Symmetry and Combinatorial Dualities
June 16, 2026 09:30 — 10:30
Preview of Michael E. Stillman - Introducing Macaulay2
Michael E. Stillman (Cornell U, Ithaca): Introducing Macaulay2
June 16, 2026 15:30 — 16:30
Preview of Nate MacFadden - Calabi-Yau Power Tools: a demo, Lecture 1
Nate MacFadden (Cornell U, Ithaca): Calabi-Yau Power Tools: a demo, Lecture 1
June 17, 2026 15:30 — 16:30
Preview of Johanna Knapp - Introduction to PALP, Lecture 1
Johanna Knapp (U Melbourne): Introduction to PALP
June 18, 2026 09:30 — 10:30
Preview of Nate MacFadden - Calabi-Yau Power Tools: a demo, Lecture 2
Nate MacFadden (Cornell U, Ithaca): Calabi-Yau Power Tools: a demo, Lecture 2
June 18, 2026 15:30 — 16:30
Preview of Emanuel Scheidegger - Introduction to PALP, Lecture 2
Emanuel Scheidegger (Peking U): Introduction to PALP
June 19, 2026 09:30 — 10:30
Preview of Gregory Smith - Toric basics: fan and quotient constructions
Gregory Smith (Queen's U, Kingston): Toric basics: fan and quotient constructions
June 22, 2026 14:00 — 15:00
Preview of Gregory Smith - Toric basics: divisors, polytopes, and positivity
Gregory Smith (Queen's U, Kingston): Toric basics: divisors, polytopes, and positivity
June 23, 2026 14:00 — 15:00
Preview of Gregory Smith - Toric basics: sheaves and cohomology
Gregory Smith (Queen's U, Kingston): Toric basics: sheaves and cohomology
June 25, 2026 14:00 — 15:00
Preview of Gregory Smith - Toric basics: subvarieties and ideals
Gregory Smith (Queen's U, Kingston): Toric basics: subvarieties and ideals
June 26, 2026 09:30 — 10:30
Preview of James Gray - Machine Learning and Calabi-Yau Metrics, Lecture 1
James Gray (Virginia Tech): Machine Learning and Calabi-Yau Metrics, Lecture 1
June 29, 2026 15:30 — 16:30
Preview of James Gray - Machine Learning and Calabi-Yau Metrics, Lecture 2
James Gray (Virginia Tech): Machine Learning and Calabi-Yau Metrics, Lecture 2
July 1, 2026 11:00 — 12:00
Preview of Vishnu Jejjala - Machine and human learning the geometry of Calabi–Yau manifolds
Vishnu Jejjala (U of Witwatersrand): Machine and human learning the geometry of Calabi–Yau manifolds
July 6, 2026 11:30 — 12:15
Preview of Tristan Hübsch - Beyond Algebraic Models of Stringy Spacetime
Tristan Hübsch (Howard U): Beyond Algebraic Models of Stringy Spacetime
July 6, 2026 14:00 — 14:45
Preview of Nana Geraldine Cabo Bizet - Toric resolutions of non compact orbifolds for M-theory
Nana Geraldine Cabo Bizet (GuanajuatoU): Toric resolutions of non compact orbifolds for M-theory
July 6, 2026 14:45 — 15:30
Preview of Anamaria Font - Comments on heterotic/F-theory duality in 8d
Anamaria Font (UCV, Caracas): Comments on heterotic/F-theory duality in 8d
July 7, 2026 09:30 — 10:15
Preview of Johanna Knapp - The reasonable ineffectiveness of non-toric geometry Notes
Johanna Knapp (U Melbourne): The reasonable ineffectiveness of non-toric geometry
July 7, 2026 11:30 — 12:15
Preview of Miles Reid - Godeaux surfaces with 5-torsion and 3-torsion
Miles Reid (U Warwick): Godeaux surfaces with 5-torsion and 3-torsion
July 7, 2026 14:00 — 14:45
Preview of Alessandro Mininno - Exploring Line Bundle Standard Models with Transformers
Alessandro Mininno (U of Wisconsin): Exploring Line Bundle Standard Models with Transformers
July 7, 2026 14:45 — 15:30
Preview of Elijah Sheridan - Applications of Toric Birational Geometry to String Compactifications
Elijah Sheridan (Cornell U, Ithaca): Applications of Toric Birational Geometry to String Compactifications
July 8, 2026 11:30 — 12:15
Preview of Fabian Ruehle - Searching for Special Lagrangian cycles in Calabi-Yau Manifolds
Fabian Ruehle (Northeastern U, Boston): Searching for Special Lagrangian cycles in Calabi-Yau Manifolds
July 9, 2026 14:00 — 14:45
Preview of Simon Telen - Positive charts of toric varieties
Simon Telen (MPI MIS, Leipzig): Positive charts of toric varieties
July 10, 2026 09:30 — 10:15
Preview of Luca Nutricati - Calabi-Yau metrics with full moduli dependence
Luca Nutricati (U of Oxford): Calabi-Yau metrics with full moduli dependence
July 10, 2026 10:45 — 11:30
Preview of Christian Haase - Exploring the Fine adjunction spectrum
Christian Haase (FU Berlin): Exploring the Fine adjunction spectrum
July 10, 2026 11:30 — 12:15
Preview of Jakob Moritz - Gopakumar-Vafa (GV) invariants, Part I: GV-invariants are BPS-indices
Jakob Moritz (U of Wisconsin-Madison): Gopakumar-Vafa (GV) invariants, Part I: GV-invariants are BPS-indices
July 13, 2026 14:00 — 15:00
At a glance
Type:
Thematic Programme
When:
June 15, 2026 — July 17, 2026
Where:
ESI Boltzmann Lecture Hall
Organizer(s):
Magdalena Larfors (Uppsala U)
Gary Shiu (U of Wisconsin-Madison)
Harald Skarke (TU Wien)
Michael E. Stillman (Cornell U, Ithaca)
More:
Website