## Past Events

##### Summer Institute 2018

Monday, June 25 |
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12:30PM | Introduction and Lunch | |

1:30PM | Mark McAvoy (Brandeis, IBS) - "The Economics of Blockchain Technology" | |

2:30PM | Coffee | |

3PM | Steve Girvin (Yale) - "Introduction to Quantum Error Correction" (Part 1) | |

Tuesday, June 26 |
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9:30AM | Steve Girvin (Yale) - "Introduction to Quantum Error Correction" (Part 2) | |

11:15AM | Jonathan Touboul (Brandeis) - "The role of noise and heterogeneity in the synchronization of neuronal networks" | |

12:45PM | Lunch | |

1:45PM | Rose Morris-Wright (Brandeis) - "Hyperbolicity in Cube complexes: an Introduction to CAT(0) Geometry" | |

2:45PM | Coffee | |

3PM | Blake Stacey (UMass Boston) - "Two Departures from Classical Information Theory" | |

Wednesday, June 27 |
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10:30AM | Zeb Rocklin (Georgia Tech) - "Introduction to the geometry and response of origami and thin sheets" | |

12PM | Lunch | |

1:30PM | Daniel Rothman (MIT) - "Biosphere-geosphere stability and mass extinction" | |

3PM | Coffee | |

3:30PM | Naziru Awal (Brandeis) - "The smallest chimera: Periodicity and chaos in a pair of coupled chemical oscillators" | |

Thursday, June 28 |
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10:30AM | James McInerney (Georgia Tech) -"Geometric properties of liquid crystals" | |

12PM | Lunch | |

1:30PM | Zeb Rocklin (Georgia Tech) - "Putting thin sheets to work: selected topics in origami metamaterials" | |

3:00PM | Coffee, discussion |

##### Spring 2018

*Thursday, January 25*

Jonathan Harper, Brandeis

*Lagrangian duality and its applications to holography*

Abstract: Dualities are tools which enable us to perceive a problem from a new perspective or framework. In this talk I will illustrate a particular example, Lagrange duality, which has been essential to my own research. Lagrange duality allows one to map a class of constrained minimization problems to a corresponding maximization problem. I will provide several examples of Lagrange duality including application to the physically relevant problem of determining constrained minimal surfaces in spacetimes with holographic duals.

*****Thursday, March 15*

Jonathan Touboul, Brandeis Mathematics

*Collective dynamics of random neural networks: complexity, synchronization and insights from random matrices theory*

Abstract: Neurons are electrically excitable cells that collectively process information to respond in a suitable, fast and adaptive manner to stimuli. I will present here a few thoughts and models on effective mathematical descriptions of large-scale neuronal networks and on the role of microscopic network parameters on collective dynamics of large neuronal networks.

Neural networks, with their asymmetric interactions, communication delays and spatial extension, display dynamics vastly distinct from classical models of equilibrium statistical physics. Deriving limits of large-scale networks and investigating their dynamics, I will exhibit in particular a mysterious and somewhat paradoxical result: neural networks may synchronize when noise or disorder exceed a specific value. Along the same lines, I will come back to a much more classical but equally mysterious transition exhibited some 30 years ago by Sompolinsky and co-workers between a fixed point regime to a chaotic regime as disorder increases. Using random matrix theory, I will show that this transition is related to an exponential explosion of fixed points, and that the complexity happens to be equal to the Lyapunov exponent of the chaotic dynamics, suggesting a possible microscopic explanation for the emergence of chaos in these networks.

If time allows, I will show that neural networks with balanced excitation and inhibition have a collective dynamics governed by the real or complex nature of an extreme eigenvalues of the connectivity matrix, and thus on new results we developed on the characterization of real eigenvalues of non-symmetric random matrices.

*Thursday, March 29*

Pathikrit Bhattacharya, Tufts University

*Do frictional interfaces really strengthen with age? Insights into the phenomenology and physics of re-strengthening of earthquake bearing faults*

Abstract: The earthquake cycle in nature alternates between periods of little or no slip on locked faults interspersed by bursts of rapid slip to release the stored strain energy as seismic waves. In order for this cycle to operate, the fault needs to re-strengthen, i.e., re-lock, between successive seismic events. Laboratory friction experiments provide an important clue to the origins of fault re-strengthening – geological materials undergoing shear driven slip show similar strengthening when slip is (nearly) arrested by unloading a large fraction of the driving shear stress. This strengthening is evidenced by the fact that the peak static friction upon resliding the sample increases linearly with the logarithm of the duration of the period of arrested slip called ‘holds’. Such frictional strengthening shows a remarkable adherence to this linear with log time increase across a wide variety of materials suggesting a degree of universality in the underlying physical processes. Traditionally, this phenomenology has been ascribed to contact aging which can proceed even in the absence of slip. In this physical picture, contact age is considered a proxy for creep induced increase in real contact area of the interface which leads to an increase in the resistance to sliding. To date, the aging model of contact strength remains the most widely used constitutive description of laboratory rock friction.

In my talk, I will discuss recent theoretical and experimental results which instead demonstrate that this widely used aging model fails to capture the salient features of laboratory observed frictional strengthening. Additionally, I will show that frictional strengthening is not only sensitive to interfacial slip but is instead dominantly controlled by it across orders of magnitude variations in slip rate below microns/sec. One implication of this result is that increase in real area of contact through creep, which has been optically recorded in transparent plastic, does not necessarily translate to an increase in interfacial strength. I will discuss statistical physics models which might offer clues as to why.

##### Fall 2017

*Thursday, September 28
* Arjun Narayanan, MIT

*A First Order Phase Transition Underlies the Formation of Sub-Diffractive Protein Aggregates in Mammalian Cells*

Abstract: Failure in protein quality control can often lead to protein aggregation, yet in neuro-degenerative diseases, by the time aggregates can be seen, the cells have advanced well into the disease pathology. We develop a quantitative imaging approach to study the protein aggregation process in living mammalian cells. We find that sub-diffractive precursor aggregates may form even in untreated cells, and their size distribution is exactly as predicted for a system undergoing a first order phase transition. Practically, this implies that as soon as aggregates reach a critical size (Rc = 162 ± 4 nm in untreated cells), they will spontaneously grow into large inclusions. Our data suggest that a previously uncharacterized, RuvBL1 dependent mechanism clears aggregates above the critical size. Our study unveils the existence of sub-diffractive aggregates in living cells; and the strong agreement between cellular data and a nucleation theory, based on first order phase transition, provides insight into regulatory steps in the early stages of aggregate formation in vivo.

*Thursday, October 19
* Eric Lowet, Boston University

*Cortical gamma-band synchronization is predicted by coupled oscillator principles*

Abstract: Changes in neuronal gamma-band synchronization by stimulation or cognitive manipulations have been extensively documented, however a mechanistic framework for establishing gamma synchronization among cortical sites is currently lacking. Here, we expand on a theory of weakly coupled oscillators, originally proposed by Ermentrout and Kopell, to help explain an enigma: how can oscillators that are not rigid in their frequency subserve communication between neuronal ensembles? Using gamma-generating network models and recordings in awake macaque V1 we show that that the instability of instantaneous frequency in the gamma-band is not a problem, but rather an asset, as it allows dynamical patterns of neural communication. We found that the properties of these frequency fluctuations and the mean frequency difference predicted well the phase-locking strength and the phase-lag between cortical sites. We also mapped the Arnold tongue of V1 gamma synchronization. The findings support the view that gamma synchronization is involved in systematic coordination of cortical activity.

*Thursday, November 9*

Ken Kamrin, MIT

*Granular Flow Continuum Modeling from Fundamentals to Applications*

Abstract: Granular materials are common in everyday life but are historically difficult to model. This has direct ramifications owing to the prominent role granular media play in multiple industries and terrain dynamics. One can attempt to track every grain with discrete particle methods, but realistic systems are often too large for this approach and a continuum model is desired. However, granular media display unusual behaviors that complicate the continuum treatment: they can behave like solid, flow like liquid, or separate into a "gas," and the rheology of the flowing state displays remarkable subtleties that have been historically difficult to model. To address these challenges, in this talk we develop a family of continuum models and solvers, permitting quantitative modeling capabilities for a variety of applications, ranging from general problems to specific techniques for problems of intrusion, impact, driving, and locomotion in grains.

To calculate flows in general cases, a rather significant nonlocal effect is evident, which is well-described with our recent nonlocal model accounting for grain cooperativity within the flow rule. On the other hand, to model only intrusion forces on submerged objects, we will show, and explain why, many of the experimentally observed results can be captured from a much simpler tension-free frictional plasticity model. This approach gives way to some surprisingly simple general tools, including the granular Resistive Force Theory, and a broad set of scaling laws inherent to the problem of granular locomotion. These scalings are validated experimentally and in discrete particle simulations suggesting a new down-scaled paradigm for granular locomotive design, on earth and beyond, to be used much like scaling laws in fluid mechanics.

##### Summer Institute 2017

Wednesday, May 31

- 10 - 11 am,
**Yiting Li**(Brandeis University)

**Title:**"Introduction to some basic background of random matrix"

**Abstract:**In this talk I will introduce some basic concepts and results in the random matrix theory. They will include: GOE, GUE, Wigner's semicircle law, Tracy-Widom distribution. If time allows I will also introduce the universality of Wigner matrix and the circular law.

- 11:30 am - 12:30 pm,
**Robert Marsland**(MIT)

**Title:**"The Edge of Thermodynamics: Driven Steady States in Physics and Biology" PDF of Marsland's talk here

**Abstract:**From its inception, statistical mechanics has aspired to become the link between biology and physics. But classical statistical mechanics dealt primarily with systems in thermal equilibrium, where detailed balance forbids the autonomous directed motion characteristic of living things. Significant theoretical effort has been expended in the last twenty years to extend thermodynamic formalism to encompass nonequilibrium structures, which are sustained by a constant flux of matter or energy. This generalization is most promising in ergodic systems, which reach a steady state in finite time that is independent of the initial condition. In my talk, I will address two basic questions about these driven steady states: Under what conditions does nonequilibrium thermodynamics tell us something new about their measurable properties? And what design goals can be achieved in these states that are impossible at equilibrium?

**Thursday, June 1**

- 10 - 11 am,
**Carl Merrigan**(Brandeis University)

**Title:**"Introduction to First Passage Times"

**Abstract:**A common statistical question that can come up is to ask what will be the the distribution of times taken for some event of interest to occur for the very first time. For instance, at what time will a neuron first fire or at what time will a stock value reach a certain threshold. First passage time questions can be dealt with exactly for many scenarios involving simple random walks and/or continuum diffusion processes. In this talk, I will give an introduction to the techniques involved by outlining the steps in calculating the first passage time distribution for a 1d lattice random walk. I will also indicate how the continuum version of the same result can be derived.

- 11:30 am - 12:30 pm,
**Yiting Li**(Brandeis University)

**Title:**"Rigidity of eigenvalues for beta ensemble in multi-cut regime" PDF

**Abstract:**I will first talk about the background and some well known results of beta ensemble. Then I will introduce the rigidity of eigenvalues for beta ensemble in multi-cut regime, i.e., the fact that each eigenvalue in the bulk is very close to its "classical location". The probability that the distance between the eigenvalue and its classical location is larger than N^{-1+r} is exponentially small where r is an arbitrarily small positive number. The model is an generalization of the beta ensemble in one-cut regime for which the rigidity of eigenvalues was proved by Bourgade, Erdos and Yau. This is the work of my thesis.

**Friday, June 2**

- 10 - 11 am,
**Xiaoming Mao**(University of Michigan)

**Title: "**Maxwell lattices and topological mechanics"

**Abstract:**In this short course I will introduce the new field of topological mechanics. I will start from basics of Maxwell lattices which are mechanical structures at the verge of instability, and discuss the recent literature of using these lattices to the study of soft matter systems. Then I will discuss how the topology of the phonon band structure of these Maxwell lattices lead to the interesting phenomena of topological floppy edge modes in these lattices, which give rise to reconfigurable asymmetric edge stiffness, with potential applications in materials science.

- 11:30 am - 12:30 pm,
**Joe Rauch**(Brandeis University)

**Title: "**Public goods production counters niche competition and enables multi-species coexistence"

**Abstract:**Traditional theoretical ecology has difficulty explaining the large amount of diversity observed in natural microbial communities. Due to observations of frequency dependent growth of microbes in the presence of an essential public good, we investigated the public good game’s influence on the diversity of microbial communities. We find the public good game reproduces both low and highly diverse communities. Additionally, the model predicts other observed features of microbial communities, including key stone species, a functional cache, and equilibrium dependence on initial colonization.

- 1:30 - 2:30 pm,
**Xiaoming Mao**(University of Michigan)

**Title: "**Maxwell lattices and topological mechanics"

**Abstract:**In this short course I will introduce the new field of topological mechanics. I will start from basics of Maxwell lattices which are mechanical structures at the verge of instability, and discuss the recent literature of using these lattices to the study of soft matter systems. Then I will discuss how the topology of the phonon band structure of these Maxwell lattices lead to the interesting phenomena of topological floppy edge modes in these lattices, which give rise to reconfigurable asymmetric edge stiffness, with potential applications in materials science.

**Monday, June 5**

- 10 - 11 am,
**Todd Gingrich**(MIT)

**Title:**"Dynamical fluctuations in Markov processes - A Primer on Stochastic Thermodynamics, Fluctuation Theorems, and Large Deviations"

**Abstract:**The dynamics of many physical systems may be modeled using Markov processes, and the statistical irreversibility of those Markov processes can be related to the nonequilibrium thermodynamics of the system (heat flow, particle flux, etc. supplied by external reservoirs). I will first review this Stochastic Thermodynamic framework then will introduce tools from Large Deviation Theory to analyze the dynamical fluctuations of Markov processes. Using these large deviation methods we will derive the entropy production fluctuation theorem as well as the more recently discovered "thermodynamic uncertainty principle" for fluctuating nonequilibrium currents.

- 11:30 am - 12:30 pm,
**Lishibanya Mohapatra**(Brandeis University)

**Title:**"How cells control the size of their organelles?"

**Abstract:**Cells contain a number of micron-scale structures, whose physiological functions are related to their size. Examples include cytoskeletal elements like mitotic spindle, cilia and actin cables. Each of these structures is characterized by a narrow size distribution and is composed of molecular building blocks (tubulin dimers and actin monomers) that diffuse in the cytoplasm. A key question in cell biology is how the size of these structures is maintained in light of constant turnover of their molecular components. Using theory, simulations and experiments in various cell types, I will describe how we can aim to uncover design principles of size-control in biology.

**Tuesday, June 6**

- 10 - 11 am,
**Brad Marston**(Brown University)

**Title:**"El Niño as a Topological Insulator: A Surprising Connection Between Climate, and Quantum, Physics”

**Abstract:**Symmetries and topology play central roles in our understanding of physics. Topology explains the precise quantization of the Hall effect and the protection of surface states in topological insulators against scattering from disorder or bumps. However discrete symmetries and topology have so far played little role in thinking about the fluid dynamics of oceans and atmospheres. I show that, as a consequence of the rotation of the Earth that breaks time reversal symmetry, equatorially trapped Kelvin and Yanai waves emerge as topologically protected edge modes. Thus the oceans and atmosphere of Earth naturally shares basic physics with topological insulators. As equatorially trapped Kelvin waves in the Pacific ocean are an important component of El Niño Southern Oscillation, these new results demonstrate that topology plays a surprising role in Earth’s climate system.

- 11:30 am - 12:30 pm,
**Todd Gingrich**(MIT)

**Title:**"Dynamical fluctuations in Markov processes - A Primer on Stochastic Thermodynamics, Fluctuation Theorems, and Large Deviations"

**Abstract:**The dynamics of many physical systems may be modeled using Markov processes, and the statistical irreversibility of those Markov processes can be related to the nonequilibrium thermodynamics of the system (heat flow, particle flux, etc. supplied by external reservoirs). I will first review this Stochastic Thermodynamic framework then will introduce tools from Large Deviation Theory to analyze the dynamical fluctuations of Markov processes. Using these large deviation methods we will derive the entropy production fluctuation theorem as well as the more recently discovered "thermodynamic uncertainty principle" for fluctuating nonequilibrium currents.

**Wednesday, June 7**

- 10 - 11 am,
**Todd Gingrich**(MIT)

**Title:**"Dynamical fluctuations in Markov processes - A Primer on Stochastic Thermodynamics, Fluctuation Theorems, and Large Deviations"

**Abstract:**The dynamics of many physical systems may be modeled using Markov processes, and the statistical irreversibility of those Markov processes can be related to the nonequilibrium thermodynamics of the system (heat flow, particle flux, etc. supplied by external reservoirs). I will first review this Stochastic Thermodynamic framework then will introduce tools from Large Deviation Theory to analyze the dynamical fluctuations of Markov processes. Using these large deviation methods we will derive the entropy production fluctuation theorem as well as the more recently discovered "thermodynamic uncertainty principle" for fluctuating nonequilibrium currents.

- 11:30 am - 12:30 pm,
**Rose Morris-Wright**(Brandeis University)

**Title:**"Generalizing Hyperbolic Space and its Groups of Isometries"

**Abstract:**Historically, hyperbolic geometry has been a rich area of research for mathematicians and physicists. To generalize this theory, consider metric spaces which have many of the same properties as classical hyperbolic space, but which are not necessarily Remannian manifolds. I will introduce these hyperbolic-like spaces, as they were proposed by Gromov in 1983. I will then discuss some of the consequences of this theory for abstract algebra and group theory. Finally, I will discuss some further generalizations which are currently being studied, especially the concept of acylindrical hyperbolicity as defined by Osin in 2016.

##### Spring 2017

Thursday, April 20

Archana Kamal (U Mass Lowell)

Quantum information processing with chiral parametric interactions

Host: Albion Lawrence

Abstract: Harnessing parametric interactions is emerging as a new paradigm in quantum information processing platforms, with applications ranging from high-efficiency readout to implementation of fast qubit gates. In this talk, I will focus on how rendering these interactions chiral leads to new functionality and qualitatively new physics. I will first describe the use of parametrically-induced chirality for in-situ routing and directional amplification of quantum signals. I will then discuss the connection of such chirality with dissipation engineering, and how it may be used to realize novel dynamics in open quantum systems.

*Thursday, March 30*

Walter Fontana (Harvard Medical School)

Replacing a world we don’t understand with a model we don’t understand

Host: Albion Lawence

Abstract: Simplifying somewaht, we might say that, in physics, understanding precedes modeling. In molecular systems biology, as we get to know more about the inner workings of cells at the molecular scale, it appears as if modeling may have to precede understanding (at least initially). A model then must become a formal and executable representation of the facts it is based upon. I will sketch a rule-based approach of this vision that is aimed at reasoning about systems of protein-protein interaction. My intent is to spend most of the time on the opportunity, but also the challenge, of reasoning about causality in such models.

*Monday, March 6*

Srikanth Sastry (Jawaharlal Nehru Centre for Advanced Scientific Research)

Structure Formation and Force Networks in Shear Jammed Sphere Packings

Host: Bulbul Chakraborty

*Thursday, March 2***
** Pavel Chvykov (MIT)

Principle of least rattling: a tale of non-equilibrium systems with disparate timescales

Host: Albion Lawrence

Abstract: For a large class of complicated interacting many-body systems, equilibrium thermodynamics manages to provide surprisingly simple principles governing the behaviors of some macroscopic, or coarse-grained, variables -- such as pressure or total energy. Nonetheless, many systems found in nature -- such as in biochemistry, ecology, traffic modelling, etc -- fall outside the constraints of equilibrium as they operate on constant energy fluxes. The vast generality of these non-equilibrium systems forces us to make simplifying assumptions to make progress: in this talk I restrict to dynamics with strong time-scale separation between a class of slowly varying degrees of freedom of interest, and the fast microscopic variables. I argue that in this case, quite generally, the slow variables tend to seek out the locations where fast dynamics are, in some sense, least chaotic or random. While illustrating this effect in specific toy-model simulations of a kicked-rotor on a cart, I also argue for more general applicability of the presented principle to active matter systems or even evolutionary adaptation.

*Wednesday, February 8*

Baylor Fox-Kemper (Brown University)

From climate to Kolmogorov - upper ocean variability across scales

Host: Albion Lawrence

##### Fall 2016

Thursday, December 1, 2016

Thursday, December 1, 2016

**Steven Gubser (Princeton)**

Joint IGERT/High Energy Theory Seminar

*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, November 17, 2016*

Daniel Ruberman (Brandeis)

*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.

*****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, October 20, 2016*

Shreyas Gokhale (MIT)

*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.

*****Thursday, October 13, 2016*

An Huang (Brandeis)

*Graph embedding, quadratic forms, and toric geometry*

Host: Albion Lawrence

*****Wednesday, October 5, 2016*

Arijeet Pal (Oxford)

*Finite temperature mobility*

*edge in many-body localized systems*

Host: Kabir Ramola

*Thursday, September 15, 2016*

Matthew Roberts (U. of Chicago)

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

****

##### Summer Institute 2016

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

**Speakers:**

- Daniel Goldstein (Brandeis University) ”A Kinetic Model of Active Extensile Bundles"
- Julian Butcher (Brandeis University) "A Continuum Theory of Active Nematics in a Bounded, Two Dimensional System"
- Sumantra Sarkar (MIT) “Force Tiling: Finding patterns in the forces"

- Geoffrey Conklin (Brandeis University) "Chemical Modelling with Semi-Classical Valence Electrons"
- Paul Miller (Brandeis University) "From the Ising model to cognition: exploring attractor states in neuroscience"
- Benjamin Hancock (Brandeis University) "Statistical Mechanics and Hydrodynamics of Self-Propelled Hard Spheres"
- Biji Wong (Brandeis University) "Turaev torsion & Seiberg-Witten invariants of 3-orbifolds"

##### Spring 2016

Wednesday, May 11, 2016

Edward Fredkin (Carnegie Mellon University)

*On Cellular Automata and Physics*

*Wednesday , April 13, 2016* Macroturbulence in the ocean

Jörn Callies (MIT)

*Wednesday, March 23, 2016
Melanie Mitchell, Portland State
*

*Using Analogy to Recognize Visual Situations*

Tuesday, March 8, 2016

Aditi Mitra (NYU)

*Quantum Quenches*

Wednesday, March 2, 2016

Carl Merrigan, Brandeis University

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

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, January 27, 2016
Naziru Awal (Brandeis)
* Piecewise Linear Model of the BZ reaction

##### Fall 2015

Wednesday, December 9, 2015

Arunima Ray (Brandeis)

*Concordance classes of knots and satellite operations*

Wednesday, October 28, 2015

Itamar Procaccia, Weizmann Institute

What determines force chains in granular media?

Wednesday, October 14, 2015

R. Loganayagam (IAS Princeton)

Joint IGERT/Condensed Matter Seminar

Second law and the eightfold structure of relativistic fluid dynamics

##### Summer Institute 2015

**
Speakers**:

- Sumit Das (University of Kentucky) "Quantum Quench and Holography" Lecture Notes
- Chandan Dasgupta (IISC, Bangalore) "Introduction to spin glasses and structural glasses"
- Rajesh Gopakumar (HRI, Allahabad and ICTS) "Vector Models at large N and Holography" Lecture Notes
- Alex Maloney (McGill University) "AdS/CFT, Quantum Entanglement and Quantum Gravity"
- Kabir Ramola (Brandeis University) "Extreme Value Statistics and Some Applications to Disordered Systems"
- Sanjib Sabhapandit (Raman Research Institute, Bangalore ) "Fluctuations and large deviations in nonequilibrium systems" Lecture Notes
- Peter Weichman (BAE Systems) "Geophysical Fluid Dynamics: A Statistical Physics Laboratory" Lecture Notes
- Paul Chesler (Harvard University) "Gravitational collapse, holography, and hydrodynamics in extreme conditions" Lecture Notes

**Student Speakers:**

- Cesar Agón (Brandeis University) "Entanglement Entropy in Quantum Field Theory and Holography" Lecture Notes
- Benjamin Hancock (Brandeis University) "Pressure and Self-Propelled Particles" Lecture Notes
- Carl Merrigan (Brandeis University) "KEP Model for Soft Glassy Materials" Lecture Notes

- Lishibanya Mohapatra (Brandeis University) "How cells control the size of their organelles" Lecture Notes

##### Spring 2015

**
**

*Wednesday, April 22, 2015*

Sho Yaida, Duke University

*Panoramic correlations in glassy systems*

*Wednesday, March 25, 2015*

Maxim Braverman (Northeastern University)

*Berry phase and the phase of the determinant*

*Wednesday, March 11, 2015*

Brad Marston, Brown University

*The Quantum and Fluid Mechanics of Climate Change
*

*February 04, 2015 *

Anatoli Polkovnikov, BU

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

*January 21, 2015*

Bard Ermentrout, University of Pittsburgh

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

##### Fall 2014

December 3 - December 5, 2014

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

##### Summer Institute 2014

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**
Subject matter/speakers:
** *Chris Santangelo (U Mass Amherst)-- "Shape and mechanics of origami folding"

*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

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"

##### Fall 2013

December 04, 2013

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"

##### Summer Institute 2013

July 31 - August 9, 2013

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

##### Spring 2013

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"

*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"

##### Fall 2012

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"

##### Spring 2012

July 03, 2012

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"

##### Fall 2012

October 28, 2012

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"

##### Fall 2011

December 07, 2011

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*

Eisenbud Lecture 1

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"