### IGERT Institutes and Workshops

IGERT Summer Institutes (2015 and 2016)

## Past Events

**Thursday, September 15, 2016**

Matthew Roberts (U. of Chicago)

3:30 pm

Abelson 229

*Emergent geometry in quantum Hall states & the composite Fermi liquid
*Host: Albion Lawrence

**Wednesday, October 5, 2016**

Arijeet Pal (Oxford)

10:00 am

Abelson 307

*Finite temperature mobility*

*edge in many-body localized systems*

Host: Kabir Ramola

**Thursday, October 13, 2016**

An Huang (Brandeis)

2:oo pm

Volen 119

*Graph embedding, quadratic forms, and toric geometry*

Host: Albion Lawrence

**Thursday, October 20, 2016**

Shreyas Gokhale (MIT)

2:00 pm

Volen 119

*Dissecting the glass transition through critical experiments on colloids*

Host: Bulbul Chakraborty

Abstract: The human race has engineered and manipulated glasses since times immemorial and yet, the basic physics underlying glass formation continues to elude our grasp. Even the most basic question of whether glass formation is a fundamentally thermodynamic or dynamic phenomenon remains unanswered. This state of affairs is due largely to the fact that available experimental data on molecular liquids, over as many as fourteen orders of magnitude, are unable to distinguish between macroscopic predictions of competing theoretical frameworks. In this talk, I will demonstrate how information on particle dynamics from experiments on dense colloidal suspensions can be harnessed to critically compare and contrast microscopic predictions of the random first-order transition theory (RFOT) and dynamical facilitation (DF), two of the most prominent competing theories of glass formation. In particular, I will show that a detailed analysis of shapes of cooperatively rearranging clusters of particles reveals a dynamical crossover from a facilitation dominated regime to one dominated by collective hopping events postulated within RFOT. Further, I will discuss how quenched disorder in the form of an amorphous wall can potentially serve as a diagnostic tool to assess the relative importance of structural relaxation mechanisms envisioned in RFOT and DF. In a broader context, these results indicate that even over the limited dynamical range available to colloid experiments and numerical simulations, dynamical crossovers can yield valuable insights into the physical processes responsible for glass formation.

**Tuesday, November 8, 2016**

Special IGERT/Physics Department Colloquium

Jeffrey Morris, CUNY

*Friction and adhesion in colloids: Yielding, thickening, jamming*

Host: Bulbul Chakraborty

Abstract: In recent work, we have shown [1,2] that frictional interactions provide a rational basis for both continuous and discontinuous shear thickening in viscous suspensions. When the repulsive forces (such as those due to electrostatic or steric colloidal stabilization) are overwhelmed by shearing forces, contact is assumed to occur, and the system transitions from a low-viscosity (lubricated) to a high-viscosity (frictional) state. Contacting particles may experience both adhesive forces as well as friction. We will consider the influence of attractive forces at contact, in combination with the stabilizing repulsive forces. This combination of forces would be seen in the case of particles with van der Waals attraction in combination with colloidal stabilization. For sufficient attractive force a yield stress and shear thinning give way to the shear thickening response, a behavior observed in certain flocculated dispersions. At sufficient yield stress, the shear thickening is completely obscured, as the dispersions shear thins after yielding directly onto the high-viscosity (frictional) plateau. The suggestion that a material may exhibit both yielding at low stress and jamming at large stress [3] is explored.

1. R. Seto, R. Mari**,** J. F. Morris & M. M. Denn 2013 Discontinuous shear thickening of frictional hard-sphere suspensions. *Phys. Rev. Lett. 111 218301.
2. . R. Mari, R. Seto J. F. Morris & M. M. Denn 2015 Discontinuous shear thickening in Brownian suspensions by dynamic simulation. Proc. National Acad. Sci.* 112. 15326.

3. N. J. Wagner & J. F. Brady 2009 Shear thickening in colloidal dispersions. Phys. Today62, 27-32.

**Thursday, November 17, 2016**

Daniel Ruberman (Brandeis)

2:00 pm

Volen 119

*Topological configurations of complex lines*

Host: Albion Lawrence

Abstract: Configurations of lines in the plane have been studied since antiquity. In recent years, combinatorial methods have been used to decide if a specified incidence relation between certain objects ("lines") and other objects ("points") can be realized by actual points and lines in a projective plane over a field. For the real and complex fields, one can weaken the condition to look for topologically embedded lines (circles in the real case, spheres in the complex case) that meet according to a specified incidence relation. I will explain some joint work with Laura Starkston (Stanford) giving new topological restrictions on the realization of configurations of spheres in the complex projective plane.

**Thursday, December 1, 2016**

Steven Gubser (Princeton)

Joint IGERT/High Energy Theory Seminar

2:00 pm

Volen 119

*p-adic AdS/CFT*

*sponsored by DOE*

Host: Albion Lawrence

Abstract: I will explain how replacing the real numbers by the p-adic numbers and the bulk geometry of anti-de Sitter space by a discrete graph, we can arrive at a new version of the AdS/CFT correspondence with some links to the p-adic string. Two-point, three-point, and four-point correlators can be computed starting from a classical action in the bulk. In some cases, adelic product identities show interesting relationships with standard results in ordinary AdS/CFT. I will describe candidate geometries for Wilson loops and comment on some ongoing work to find further probes of the correspondence.

Thursday, July 7, 2016 - Tuesday July 12, 2016

IGERT Summer Conference

Schedule

Wednesday, January 27, 2016

Naziru Awal (Brandeis)

*Piecewise Linear Model of the BZ reaction
*

Wednesday, February 10, 2016

Ruoran Zhang, Northeastern University (Note: Quantitative Biology Lunch also held at this time).

*Contact Chern-Simons Theory and Legendrian Knots
*

Wednesday, March 2, 2016

Carl Merrigan, Brandeis University

*Role of the Initial Force Configuration for Unjamming Grains in a Hopper
*

Tuesday, March 8, 2016

Aditi Mitra (NYU)

*Quantum Quenches*

Wednesday, March 23, 2016

Melanie Mitchell, Portland State

*Using Analogy to Recognize Visual Situations*

Wednesday**,** April 13**,** 2016

Jörn Callies (MIT)

*Macroturbulence in the ocean*

****Wednesday, May 11, 2016

Edward Fredkin (Carnegie Mellon University)

*On Cellular Automata and Physics
*

Wednesday, October 14, 2015

R. Loganayagam (IAS Princeton)

Joint IGERT/Condensed Matter Seminar

Second law and the eightfold structure of relativistic fluid dynamics

Wednesday, October 28, 2015

Itamar Procaccia, Weizmann Institute

What determines force chains in granular media?

Wednesday, December 9, 2015

Arunima Ray (Brandeis)

*Concordance classes of knots and satellite operations
*

****

January 21, 2015

Bard Ermentrout, University of Pittsburgh

*Keeping the beat : Homeostatic frequency control in coupled oscillators*

February 04, 2015

Anatoli Polkovnikov, BU

*Emergent non-adiabatic dynamics and geometric response in interacting systems*

Wednesday, March 11, 2015

Brad Marston, Brown University

*The Quantum and Fluid Mechanics of Climate Change
*

Wednesday, March 25, 2015

Maxim Braverman (Northeastern University)

*Berry phase and the phase of the determinant*

Wednesday, April 22, 2015

Sho Yaida, Duke University

*Panoramic correlations in glassy systems*

December 3 - December 5, 2014

Peter Sarnak, Institute for Advanced Study and Princeton University

Eisenbud Lectures

Theme: "Randomness in Number Theory and Geometry"

November 13, 2014

Ryan Grady, Boston University**
** Applications of quantum field theory to geometry and topology: observables and index theory

October 15, 2014

Ben Allen, Emanuel College and Harvard University

**Title:**

*"*An Information-Theoretic Formalism for Multiscale Structure in Complex Systems"

**October 01, 2014**

Daniel Goldstein, Brandeis University

**Title: "How Many Timescales Can I Fit into the Brusselator**

**September 17, 2014**

Jessica Lowell, (Computer Science), Brandeis University

Title: "The evolution of modularity in neural networks

September 3, 2014

Igert Kickoff Meeting

July 9, 2014

Yair Shokef, Tel Aviv University**
Title: "**Confinement Effects on the Jamming Transition in Kinetically-Constrained Models"

June 16 - June 27

Igert Summer Institute, Brandeis University

***Chris Santangelo (U Mass Amherst)-- "Shape and mechanics of origami folding"**

Subject matter/speakers:

Subject matter/speakers:

*Matthew Headrick -- "Introduction of quantum information theory"

*Bulbul Chakraborty and Blake Lebaron -- "Applications of Statistical Mechanics to Finance"

*Daniel Ruberman -- "Introduction to Knot Theory"

*Paul Miller -- "Feedback control in neural firing"

*Albion Lawrence -- "An introduction to inflation and gravity waves". This last speech was for a very general audience and explained the recent excitement surrounding the BICEP2 experiment.

In addition, student seminars by Eli Putzig (Physics), Honi Sanders (Neuroscience), and Tony Ng (Neuroscience).

Spring 2014

Igert Course held: "Differential Geometry in Classical and Quantum Mechanics"

March 26, 2014

Daniel Ruberman, Brandeis, Dept. of Mathematics

Title: "Chern-Weil theory and Chern-Simons invariants"

February 12, 2014

Richard M. Ellis, Umass Amherst

Title: "From Large Deviations to Statistical Mechanics: What Is the Most Likely Way for an Unlikely Event To Happen?"

January 29, 2014

Prof. Sophia Malamud, Dept. Computer Science, Brandeis University

Title: "Language as rational behaviour under uncertainty: applications of Decision Theory"

January 22, 2014

Prof. Albion Lawrence, Brandeis University

Title: "Higgs and hierarchy: the science behind the 2013 Nobel Prize in Physics" December 04, 2013

Yaneer Bar-Yam, Lawrence Albion, NECSI

Title: "The Global Financial and Food Crisis: A Complex Systems Science Analysis"

November 20, 2013

Lawrence Albion, Michael Hagan, Blake LeBaron

Title: ""The science behind the 2013 Nobel Prizes"

October 30, 2013

Pavel Sountsov, Brandeis University

Title: "Statistical mechanics and statistical inference"

October 23, 2013

Patrick Charbenneau, Duke University

Title: ""A soft-matter perspective on protein crystallization"

October 22, 2013

Patrick Charbonneau, Duke University

Colloquium sponsored by Igert

Title: "High-dimensional surprises near the glass and the jamming transitions"

October 2, 2013

Prof. Shamit Kachru, Standford University

Title: "Moonshine and Supersymmetric String Compactifications"

September 25, 2013

David Huse, Princeton University

"Eigenstate phase transitions and localization-protected order"

September 24, 2013

Physics Colloquium, sponsored by Igert

David Huse, Princeton University

"Thermalization and localization in quantum statistical mechanics"

September 4, 2013

Igert Group Meeting

Agenda: "Discuss goals and opportunities in coming year"

July 31 - August 9, 2013

"Geometry and Dynamics Summer Institute"

Lecturers:

Parongama Sen, (University of Calcutta, Kolkata), lecturing on applications of statistical physics to social science problems.

Henry Cohn (Microsoft Research, New England), lecturing on symmetry and optimization.

Ben Allen (Emmanuel College and Harvard), lecturing on evolutionary dynamics

Paul Miller, (Brandeis), lecturing on aspects of theoretical neuroscience.

Blake LeBaron (Brandeis), lecturing on empirical puzzles in financial data, and applications of agent-based modeling.

Albion Lawrence (Brandeis), lecturing on fiber bundles ("gauge theory") and their applications to deformable bodies (falling cats, swimming bacteria).

In addition, seminars by IGERT students:

Sumantra Sarkar, Physics Dept., Brandeis University, "Origin of Rigidity in Dry Granular Solids"

Blake Stacey, Physics Dept., Brandeis University, "Mesoscale Structure in Complex Networks”

Danny Goldstein, Physics Dept., Brandeis University, TBA

May 15, 2013

Justin Kinney, Cold Springs Harbor Laboratory

Title: "Quantum field theories for modeling biochemical systems"

May 08, 2013

Raul Kulkarni, Umass Boston

Tiitle: "Stochastic gene expression and queueing theory: analytical results and application"

April 25, 2013

Women in Science Seminar

Thseh-Hwan Yong, Threla Cosmetics

Title: Science Entrepreneurship

April 17, 2013

Art of Science Lecture Series

Debbie Chacra, Professor, Olin College of Engineering

Info at: http://www.brandeis.edu/programs/wgs/news/womeninscience.html

April 10, 2013

IGERT Seminar

Claudio Chamon, Boston University

"Renyi entropies as a measure of the complexity of counting problems"

March 20, 2013

IGERT Seminar

Pietro Dindo, University of Pisa

Title: "Evolution and market behavior with endogenous rules"

Paper1: http://www.brandeis.edu/igert/images/documents/pietro2011.pdf

Paper2: http://www.brandeis.edu/igert/images/documents/pietro2012b.pdf

March 13, 2013

Art of Science Lecture Series

Dianna Dabby, Professor, Olin College of Engineering

Title: "Creating Musical Variation - from Chaos"

Info at: http://www.brandeis.edu/programs/wgs/news/womeninscience.html

February 06, 2013

IGERT Seminar

Olivier Bernardi, Brandeis University, Dept. of Mathematics

Title: "Random colored lattices"

October 28, 2012

IGERT Seminar

Tom Butler, MIT

Title: "Universal Critical Dynamics in High Resolution Neuronal Avalanche Data"

October 24, 2012

IGERT Seminar

Royce Zia, Virginia Tech

Title: "Survival of the Weakest? Lessons from studies of many competing species in general and four cyclic competitor in particular"

October 03, 2012

IGERT Seminar

Tony Ng, Dept. of Neuroscience, Brandeis University.

Title: "Criticality in neuronal networks: Existing evidence and models"

September 19, 2012

IGERT Seminar

Blake Stacey, Dept. of Physics, Brandeis University

"Community Formation in Nonequilibrium Spatial Ecosystems"

July 03, 2012

IGERT Seminar

Debashish Chowdhury, Physics Dep., Indian Institute of Technology

"Stochastic kinetics of template-directed bio-polymerization: machines and mechanisms"

April 25, 2012

IGERT Seminar

Taylor Hughes, UIUC

"Torsion and Viscosity in Condensed Matter Physics"

April 18, 2012

IGERT Seminar

Dr. Alvaro Sanchez, MIT

"Evolution and ecology in a feedback loop: consequences of social and antisocial behavior in microbial communities"

April 04, 2012

IGERT Seminar

Jordan Pollack, Brandeis University (Computer Science)

"Beyond Competition: Progress in Co-evolutionary Learning"

March 21, 2012

IGERT Seminar

Susan Coppersmith, U. of Wisconsin, Madison

"Quantum random walks of interacting particles and the graph isomorphism problem."

March 14, 2012

IGERT Seminar

Patrick Hayden, McGill University

"Towards the fast scrambling conjecture"

March 07, 2012

IGERT Seminar

Matthew Headrick, Brandeis University

"Some basic aspects of quantum information theory"

March 05, 2012

IGERT Seminar

Takashi Odagaki, Dept. of Physics, Tokyo Denki University

"The 99%: Who is to blame?"

February 24, 2012

IGERT Seminar

David Sivak, Lawrence Berkley national Laboratory

"The 99%: Who is to blame?"

February 15, 2012

IGERT Seminar

Albion Lawrence, Brandeis University

"An Introduction to Information and Entropy"

December 07, 2011

IGERT Seminar

Max Bi, Brandeis University

The statistical mechanics of granular matter"

December 01, 2011

Eisenbud Lecture 2

Jennifer Chayes, Microsoft Research New England

"The Mathematics of Dynamic Random Networks"

November 29, 2011

Jennifer Chayes, Microsoft Research New England

"The Mathematics of Dynamic Random Networks"

November 16, 2011

IGERT Seminar

Matthew Graham, Brandeis University

"Knots, invariants and how a low dimensional geometric topologist thinks"

November 9, 2011

IGERT Seminar

David Lazer, Northeastern University

"How we think together: the role of networks in collective problem solving"

October 19, 2011

IGERT Seminar

Paul Miller, Brandeis University

"Leaning to solve cognitive tasks: global function from local rules"