Structure of Collapsed Special Holonomy Spaces, Duke University, 913 April 2018
Arrival date: Sunday, April 8, 2018. Departure date: Friday, April 13, 2018.
The conference venue is the 21C Hotel in downtown Durham, North Carolina.
Tentative Schedule
MON 9 APR 
TUE 10 APR 
WED 11 APR 
THU 12 APR 
FRI 13 APR 

8:00 9:00 
Breakfast  Breakfast  Breakfast  Breakfast  Breakfast 
9:0010:00 
R. Zhang  J. Cheeger  X. Rong  R. Zhang  D. Morrison 
10:0010:15 
Q+A  Q+A  Q+A  Q+A  Q+A 
10:1511:00 
Coffee  Coffee  Coffee  Coffee  Coffee 
11:0012:00 
Y. Zhang  R. Mazzeo  R. Mazzeo  Y. Li  Y. Li 
12:002:00 
Lunch/Discussion  Lunch/Discussion  Lunch/Discussion  Lunch/Discussion  Lunch/Discussion 
2:003:00 
G. Wei  G. Chen  L. Foscolo  M. Haskins  S. Salamon 
3:003:30 
Coffee  Coffee  Coffee  Coffee  Coffee 
3:304:30 
R. Zhang  Y. Zhang  J. Viaclovsky  Discussion  
7:009:00 
Conference banquet 
Speakers:
 Jeff Cheeger (Courant), Curvature and injectivity radius estimates for Einstein manifolds
 Gao Chen (IAS), Classification of gravitational instantons
 Lorenzo Foscolo (HeriotWatt), Examples of collapsing 4dimensional hyperkähler metrics
 Mark Haskins (Bath), Uncollapsing highly collapsed holonomy metrics
 Yang Li (Imperial College London), Nonlinear perspective of collapsing CY metrics on K3 fibred 3folds
 Yang Li (Imperial College London), A gluing construction of collapsing CY metrics on K3 fibred 3folds
 Rafe Mazzeo (Stanford), The largescale structure of the Hitchin moduli space
 Rafe Mazzeo (Stanford), Analysis of elliptic operators on complete spaces with asymptotically regular collapsing geometry
 Dave Morrison (UC Santa Barbara), Collapsing metrics in string theory and Mtheory
 Xiaochun Rong (Rutgers), Collapsed manifolds with Ricci local bounded covering geometry
 Simon Salamon (King’s College London), Automorphisms of Fano contact manifolds
 Jeff Viaclovsky (UC Irvine), Gravitational collapsing of K3 surfaces I
 Guofang Wei (UC Santa Barbara), Manifolds with integral curvature bound
 Ruobing Zhang (Stony Brook), Introduction to Ricci curvature and the convergence theory
 Ruobing Zhang (Stony Brook), Quantitative nilpotent structure and regularity theorems of collapsed Einstein manifolds
 Ruobing Zhang (Stony Brook), Gravitational collapsing of K3 surfaces II
 Yuguang Zhang (Imperial College London), Collapsing of CalabiYau manifolds and special lagrangian submanifolds
 Yuguang Zhang (Imperial College London), Collapsing of HyperKahler manifolds
Sir Simon Donaldson to deliver the Marston Morse Lecture Series
Sir Simon Donaldson, one of our Collaboration’s Principal Investigators, will deliver the Marston Morse Lectures at the Institute for Advanced Study during the first week of April, 2018, under the general title “Exceptional holonomy and related geometric structures.” The detailed schedule of lectures is here.
Robert Bryant delivers the McKnightZame Distinguished Lecture
Collaboration Director Dr. Robert Bryant delivered the 2018 McKnightZame Distinguished Lecture at the University of Miami on March 1, 2018. The lecture, entitled “From Mechanics, to Algebra, to Geometry: The Notion of Holonomy,” introduced a general mathematical audience to the main theme of this Collaboration. Further details about the lecture series and Dr. Bryant’s lecture can be found here.
Xenia de la Ossa: Lectures
January 8, 2018
TITLE: The geometry and moduli of heterotic G2 structures
ABSTRACT: A heterotic system is a quadrupole , where is a seven dimensional manifold with an integrable structure and is the corresponding associative three form, is a bundle on with an instanton connection , and is an instanton connection on the tangent bundle . is a three form given in terms of the field and the ChernSimons forms of and (the anomaly cancelation condition) which is further constrained so that it is equal to a natural three form uniquely determined by the structure on . This constraint mixes up the geometry of with that of the bundles.
I will describe the tangent space of the moduli space of these systems. We first prove that a heterotic system is equivalent to an exterior covariant derivative acting on forms with values on the bundle which satisfies , for some appropriately defined projection of the operator . Remarkably, this equivalence implies the (Bianchi identity of) the anomaly cancellation condition. We show that the infinitesimal moduli space is given by the cohomology group and that it is finite dimensional. Our analysis leads to results that are of relevance to all orders in . Time permitting, I will comment on work in progress about the finite deformations of heterotic systems and the relation to differential graded Lie algebras.
From the physics perspective these structures give rise to very interesting three dimensional gauge supergravity theories (on Minkowski or AdS3) with only N=1 supersymmetry. Very little is known about these theories, as opposed to those with or , however we seem to have just enough supersymmetry to be able to deduce some interesting features of the effective field theories.
G2 Working Group at the Aspen Center for Physics
The Simons Collaboration on Special Holonomy in Geometry, Analysis, and Physics sponsored a G2 working group at the Aspen Center for Physics from August 7 through August 25, 2017. The working group was attended by Andreas Braun (Oxford), Michele Del Zotto (SCGP), Jim Halverson (Northeastern), Magdalena Larfors (Uppsala), Dave Morrison (UC Santa Barbara), and Sakura SchaferNameki (Oxford).
The topics discussed included:
 gauge theory on G2 manifolds and G2 compactifications of the heterotic string
 singular fibers of SYZ fibrations of CalabiYau threefolds and what they might correspond to in K3fibered G2 manifolds
 the structure of the gauge degrees of freedom in G2 compactifications, including BPS equations and Higgs bundle as function of the associative threemanifold base
 G2 compactifications of Mtheory possesing both Ftheory and heterotic duals, in particular the various moduli of such models including the role of the D3branes from the Ftheory realization.
Research papers which result from this activity will be included in the publication list on this website. Stay tuned!
First Annual Meeting: September 1415, 2017, Simons Foundation, New York City
Arrival date: Wednesday, September 13. Departure date : Friday afternoon, September 15, or Saturday, September 16. This conference will run from Thursday morning through Friday lunch.
Spaces with special holonomy are of intrinsic interest in both mathematics and mathematical physics; they appear in many contexts in Riemannian geometry, particularly Ricciflat and Einstein geometry, minimal submanifold theory and the theory of calibrations, and gauge theory. The exceptional cases, which occur in dimensions 7 and 8, remain the most challenging and the least understood. Nevertheless, they share important features with the betterknown case of SU(n) holonomy, where the three types of structures are known as CalabiYau spaces, Hermitian Yang–Mills connections, and special Lagrangian and complex submanifolds. The exceptional holonomy spaces play key roles in the study of fundamental physical theories such as Mtheory and Ftheory (generalizing the role that CalabiYau 3folds play in string theory), and progress in these theories depends crucially on a better understanding of spaces (especially singular ones) with exceptional holonomy.
The Simons Collaboration on Special Holonomy in Geometry, Analysis, and Physics will hold its first Annual Meeting at the Simons Foundation on September 14 & 15, 2017. Four of its principal investigators and four of its postdoctoral fellows will present reports on the most recent developments in various aspects of the field of special holonomy, including the study of adiabatic limits, moduli problems, collapse, gluing constructions using methods from algebraic geometry, and connections with physics. They will discuss their research progress during the first year of the collaboration and the current directions of research
The speakers are:
 Andreas Braun (Oxford)
 Sir Simon Donaldson (Imperial College and SCGP)
 Andriy Haydys (Freiberg)
 Mark Haskins (Bath)
 Dominic Joyce (Oxford)
 Eirik Svanes (King’s College London)
 David R. Morrison (UC Santa Barbara)
 Yuguang Zhang (Imperial College London)
Special Holonomy: Progress and Open Problems 2017: September 1013, 2017, SCGP, Stony Brook
Arrival date: Saturday, September 9.
Departure date: Wednesday afternoon, September 13, or Thursday, September 14.
Schedule
Sun. Sept. 10  Mon. Sept. 11  Tues. Sept. 12  Wed. Sept. 13  

8:30  BREAKFAST  
9:30  Simon Salamon  Bobby Acharya  Aleksander Doan  Gao Chen 
10:30  MORNING BREAK  
11:00  Jason Lotay  Daniel Butter  Sebastian Goette  Joel Fine 
12:00  LUNCH  
1:15  Gavin Ball  Lorenzo Foscolo  Sergei Gukov  Thomas Walpuski 
2:30  Robert Bryant  Johannes Nordström  Samson Shatashvili  Song Sun 
3:30  AFTERNOON TEA  –  
4:00  Discussion  Discussion  Discussion 
Speakers & Lecture titles:
 Bobby Acharya (ICTP and King’s College London), Mtheory/heterotic/type IIA duality
 Gavin Ball (Duke University), SO(4)structures on 7manifolds
 Robert Bryant (Duke University), Algebraically special associative submanifolds and special holonomy metrics
 Daniel Butter (Texas A&M), ElevenDimensional Supergravity in 4D, N=1 Superspace
 Gao Chen (Institute for Advanced Study), Rate of asymptotic convergence near isolated singularity of a G_{2} manifold
 Aleksander Doan (Stony Brook), Fueter sections and wallcrossing in SeibergWitten theory
 Joel Fine (Université Libre de Bruxelles), Hypersymplectic 4manifolds and the G_{2} Laplacian flow
 Lorenzo Foscolo (HeriotWatt University), ALC manifolds with special holonomy
 Sebastian Goette (Freiburg), The extended vinvariant — progress and problems
 Sergei Gukov (Caltech), Topological Phases and Special Holonomy
 Jason Lotay (University College London), Invariant coassociative 4folds via gluing
 Johannes Nordström (Bath), New asymptotically conical G_{2}manifolds
 Simon Salamon (King’s College London), Quotients and hypersurfaces of model metrics
 Samson Shatashvili (Trinity College Dublin and SCGP), G_{2} superconformal theories and mirror symmetry revisited
 Song Sun (Stony Brook), Singularities of HermitianYangMills connections
 Thomas Walpulski (Michigan State), The (1,k)ADHM SeibergWitten equation and kfold covers of associatives
This conference will be immediately followed by our First annual meeting held at the Simons Foundation in New York City.
Adam Jacob: Lectures
June 9, 2017
TITLE: Hermitian Yang Mills connections on reflexive sheaves
Alexei Kovalev: Lectures
June 7, 2017
TITLE: Constructing compact, holonomy Spin(7) manifolds as generalised connected sums
Andreas Braun: Lectures
September 14, 2017
TITLE: Mirror Symmetry for G_{2} manifolds
ABSTRACT: String theories on different manifolds can lead to the same physics in a phenomenon called mirror symmetry. In this talk, I will review mirror symmetry for manifolds, focusing on recent progress. In particular, I will present constructions of mirror manifolds realized as twisted connected sums.