Conference

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Wall-crossing structures

Yan Soibelman Kansas State University

October 23, 2013

PIRSA:13100119
Blobbed topological recursion

Gaetan Borot

October 22, 2013

PIRSA:13100118
Algebraic structures in massive (2,2) theories

Davide Gaiotto Perimeter Institute for Theoretical Physics

October 22, 2013

PIRSA:13100117
Exact Results In Two-Dimensional (2,2) Supersymmetric Gauge Theories With Boundary

Kentaro Hori University of Tokyo

October 22, 2013

PIRSA:13100116
Exact results for boundaries and domain walls in 2d supersymmetric theories

Takuya Okuda University of Tokyo

October 22, 2013

PIRSA:13100115
Coisotropic branes, surface defects and mirror symmetry

Emanuel Diaconescu

October 21, 2013

PIRSA:13100113
Hybrid conformal field theories

October 21, 2013

PIRSA:13100114
Some simple extensions of Mathieu Moonshine

Shamit Kachru Stanford University

October 21, 2013

PIRSA:13100112
Panel Discussion: Physics in Times of Austerity

Marc Garneau House of Commons

August 16, 2013

PIRSA:13080043
3D Digital Holographic Interferometry: Applications in Biomedicine

August 16, 2013

PIRSA:13080047
Atomic Physics in the Era of Control: What every physicist should know about the 2012 Physics Nobel Prize

Wes Campbell University of California, Los Angeles

August 16, 2013

PIRSA:13080042
The impact of the Atmosphere on space-bound Vehicles

August 16, 2013

PIRSA:13080046

Wall-crossing structures

Yan Soibelman Kansas State University

October 23, 2013

PIRSA:13100119

The concept of wall-crossing structure (WCS for short) was introduced recently in my joint work with Maxim Kontsevich. WCS appear in different disguises in the theory of Donaldson-Thomas invariants of Calabi-Yau 3-folds, quiver representations,integrable systems of Hitchin type, cluster algebras, Mirror Symmetry, etc.
I plan to discuss the definition of WCS and illustrate it in several well-known examples. If time permits I will speak about a special class of WCS called rational WCS. It gives rise to wall-crossing formulas with factors which are algebraic functions. Conjecturally such WCS appear in Hitchin integrable systems with singularities.
Blobbed topological recursion

Gaetan Borot

October 22, 2013

PIRSA:13100118

Hermitian matrix models have been used since the early days of 2d quantum gravity, as generating series of discrete surfaces, and sometimes toy models for string theory. The single trace matrix models (with measure dM exp( - N Tr V(M)) have been solved in a 1/N expansion in the 90s by the moment method of Ambjorn et al. Later, Eynard showed that it can be rewritten more intrinsically in terms of algebraic geometry of the spectral curve, and formulated the so-called topological recursion. In a similar way, we will show that double hermitian matrix models are solved by the same topological recursion, and more generally, that arbitrary hermitian matrix models are solved by a "blobbed topological recursion", whose properties still have to be investigated.
Algebraic structures in massive (2,2) theories

Davide Gaiotto Perimeter Institute for Theoretical Physics

October 22, 2013

PIRSA:13100117

I will review some ongoing work on the low energy properties of D-branes/boundary conditions in massive two-dimensional field theories with (2,2) supersymmetry.
Exact Results In Two-Dimensional (2,2) Supersymmetric Gauge Theories With Boundary

Kentaro Hori University of Tokyo

October 22, 2013

PIRSA:13100116

We compute the partition function on the hemisphere of a class of two-dimensional (2,2) supersymmetric field theories including gauged linear sigma models. The result provides a general exact formula for the central charge of the D-brane placed at the boundary. It takes the form of Mellin-Barnes integral and the question of its convergence leads to the grade restriction rule concerning branes near the phase boundaries. We find expressions in various phases including the large volume formula in which a characteristic class called the Gamma class shows up. The two sphere partition function factorizes into two hemispheres glued by inverse to the annulus. The result can also be written in a form familiar in mirror symmetry, and suggests a way to find explicit mirror correspondence between branes.
Exact results for boundaries and domain walls in 2d supersymmetric theories

Takuya Okuda University of Tokyo

October 22, 2013

PIRSA:13100115

We apply supersymmetric localization to N=(2,2) gauged linear sigma models on a hemisphere, with boundary conditions, i.e., D-branes, preserving B-type supersymmetries. We explain how to compute the hemisphere partition function for each object in the derived category of equivariant coherent sheaves, and argue that it depends only on its K theory class. The hemisphere partition function computes exactly the central charge of the D-brane, completing the well-known formula obtained by an anomaly inflow argument. We also formulate supersymmetric domain walls as D-branes in the product of two theories. We exhibit domain walls that realize the sl(2) affine Hecke algebra. Based on arXiv:1308.2217.
Coisotropic branes, surface defects and mirror symmetry

Emanuel Diaconescu

October 21, 2013

PIRSA:13100113
Hybrid conformal field theories

October 21, 2013

PIRSA:13100114

I will discuss a class of limiting points in the moduli space of d=2 (2,2) superconformal field theories. These SCFTs arise as IR limits of "hybrid" UV theories constructed as a fibration of a Landau-Ginzburg theory over a base Kaehler geometry. A significant generalization of Landau-Ginzburg and large radius geometric limit points, the hybrid theories can be used to probe general features of (2,2) and (0,2) SCFT moduli spaces.
Some simple extensions of Mathieu Moonshine

Shamit Kachru Stanford University

October 21, 2013

PIRSA:13100112

Mathieu Moonshine is a striking and unexpected relationship between the sporadic simple finite group M24 and a special Jacobi form, the elliptic genus, which arises naturally in studies of nonlinear sigma models with K3 target. In this talk, we first discuss its predecessor (Monstrous Moonshine), then discuss the current evidence in favor of Mathieu Moonshine. We also discuss extensions of this story involving `second quantized mirror symmetry,' relating heterotic strings on K3 to type II strings on Calabi-Yau threefolds.
Panel Discussion: Physics in Times of Austerity

Marc Garneau House of Commons

August 16, 2013

PIRSA:13080043
3D Digital Holographic Interferometry: Applications in Biomedicine

August 16, 2013

PIRSA:13080047

Digital Holographic Interferometry (DHI) plays an important role in the evaluation of object static and dynamic displacements. The state of the art research on this technique is such that it is being used to solve problems in a wide variety of disciplines, from basic Physics to engineering and even social sciences. This invited plenary talk will deal with specific applications in some biomedical objects, even showing preliminary results using Electron Holography.
Atomic Physics in the Era of Control: What every physicist should know about the 2012 Physics Nobel Prize

Wes Campbell University of California, Los Angeles

August 16, 2013

PIRSA:13080042

To say that atomic, molecular, and optical (AMO) physics underwent a revival in the 80s and 90s is to acknowledge that it was in need of reviving. Prior to this rebirth, high-quality research was being done in many labs, but it was primarily passive with respect to atomic motion. The demonstration of laser cooling in 1978 ushered in a new era where the full quantum states (internal and external) of atoms would be precisely controlled in the following decades. This control has essentially given today’s AMO physicist the power to “realize the gedanken” and build experiments that exploit quantum mechanics to perform computations, simulations, and measurements with tremendous speed and precision. I will discuss some of the current challenges and potential of this exciting time in the field of AMO physics through the lens of a case study of some of the work of this year’s Nobel Laureates, Dave Wineland and Serge Haroche.
The impact of the Atmosphere on space-bound Vehicles

August 16, 2013

PIRSA:13080046

When rockets and space-bound vehicles are fired into space, they have to deal with turbulence, winds and waves in the Earth's atmosphere. Different height regimes cause different problems. In the lower regions (0 to 20 km altitude), winds and turbulence are major issues, whereas above 50 km altitude, large atmospheric waves have serious importance on safe passage. Similar issues arise on re-entry. In this talk, I will discuss the ways in which these atmospheric phenomena manifest themselves, and how they are best mitigated. One example of particular significance will be the Space Shuttle Columbia disaster, for which I consulted with NASA in respect to possible atmospheric influences. I will also describe some of the instrumentation used to measure these phenomena.

Title	Speaker(s)	Date	Talk Type	Info link
Wall-crossing structures	Yan Soibelman	2013-10-23	Conference	View details
Blobbed topological recursion	Gaetan Borot	2013-10-22	Conference	View details
Algebraic structures in massive (2,2) theories	Davide Gaiotto	2013-10-22	Conference	View details
Exact Results In Two-Dimensional (2,2) Supersymmetric Gauge Theories With Boundary	Kentaro Hori	2013-10-22	Conference	View details
Exact results for boundaries and domain walls in 2d supersymmetric theories	Takuya Okuda	2013-10-22	Conference	View details
Coisotropic branes, surface defects and mirror symmetry	Emanuel Diaconescu	2013-10-21	Conference	View details
Hybrid conformal field theories		2013-10-21	Conference	View details
Some simple extensions of Mathieu Moonshine	Shamit Kachru	2013-10-21	Conference	View details
Panel Discussion: Physics in Times of Austerity	Marc Garneau	2013-08-16	Conference	View details
3D Digital Holographic Interferometry: Applications in Biomedicine		2013-08-16	Conference	View details
Atomic Physics in the Era of Control: What every physicist should know about the 2012 Physics Nobel Prize	Wes Campbell	2013-08-16	Conference	View details
The impact of the Atmosphere on space-bound Vehicles		2013-08-16	Conference	View details

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Format results

Wall-crossing structures

Blobbed topological recursion

Algebraic structures in massive (2,2) theories

Exact Results In Two-Dimensional (2,2) Supersymmetric Gauge Theories With Boundary

Exact results for boundaries and domain walls in 2d supersymmetric theories

Coisotropic branes, surface defects and mirror symmetry

Hybrid conformal field theories

Some simple extensions of Mathieu Moonshine

Panel Discussion: Physics in Times of Austerity

3D Digital Holographic Interferometry: Applications in Biomedicine

Atomic Physics in the Era of Control: What every physicist should know about the 2012 Physics Nobel Prize

The impact of the Atmosphere on space-bound Vehicles

Wall-crossing structures

Blobbed topological recursion

Algebraic structures in massive (2,2) theories

Exact Results In Two-Dimensional (2,2) Supersymmetric Gauge Theories With Boundary

Exact results for boundaries and domain walls in 2d supersymmetric theories

Coisotropic branes, surface defects and mirror symmetry

Hybrid conformal field theories

Some simple extensions of Mathieu Moonshine

Panel Discussion: Physics in Times of Austerity

3D Digital Holographic Interferometry: Applications in Biomedicine

Atomic Physics in the Era of Control: What every physicist should know about the 2012 Physics Nobel Prize

The impact of the Atmosphere on space-bound Vehicles