Seminars Sorted by Series

Motivic Cohomology

Feb
13
2007

Motivic Cohomology

The Syntomic Regulator for K_1 of Surfaces
2:00pm|S-101

We give an explicit formula for the syntomic regulator of certain elements in the first algebraic K-theory group of a smooth complete surface over the ring of integers of a p-adic field. The formula uses the theory of Coleman integration and the...

Feb
22
2007

Motivic Cohomology

Arithmetic Cohomology and Special Values of Zeta-Functions (after Geisser)
11:00am|S-101

Geisser gives conjectured formulas for special values of zeta-functions of varieties over finite fields in terms of Euler characteristics of arithmetic cohomology (an improved version of Weil-etale cohomology). He then proves these formulas under...

Mar
01
2007

Motivic Cohomology

Bass' NK Groups and cdh-Fibrant Hochschild Homology
11:00am|S-101

By definition, NK_0(R) is K_0(R[t]) modulo K_0(R). We give a formula for this group when R is of finite type over a field of characteristic zero. The group is bigraded and determined by its typical pieces, which are the cdh cohomology groups H^p(R...

Mar
08
2007

Motivic Cohomology

Operations with Integer Coefficients (After Voevodsky)
11:00am|S-101

We will classify all unstable motivic operations from bidegree (2n,n) (with coefficients Z) to bidegree (p,q) with coefficients Z/l, l>2. All such operations are polynomials on the elements of the Steenrod Algebra. This work is based upon some...

Mar
15
2007

Motivic Cohomology

Cycles on Complete Intersections
12:00pm|S-101

We will describe some bounds on the multidegrees of complete intersections to have trivial Chow groups in low dimensions.

Apr
12
2007

Motivic Cohomology

Overconvergent Homotopy Invariant Presheaves with Transfers over Smooth Rigid Varieties
11:00am|S-101

Let F be a presheaf with transfers on the category of smooth affinoid varieties over a non-archemidean field. Suppose that F is overconvergent and homotopy invariant. Then the presheaves H^i(-,F) are also homotopy invariant (where the cohomology is...

Apr
19
2007

Motivic Cohomology

Completion of the Proof of the Bloch-Kato Conjecture
Chuck Weibel
11:00am|S-101

In the last eight lectures, we have reduced the proof of the Bloch-Kato to an assertion about motivic cohomology operations. We will prove that this assertion is correct, and so complete the proof of the Bloch-Kato conjecture.

Motivic Cohomology with Z/l-Coefficients

Motivic Eilenberg-Maclane Spaces Seminar

Neuroscience Day

May
13
2003

Neuroscience Day

Analysis of a biologically inspired model of visual cortex
Mike Shelley
9:30am|Dilworth Room
May
13
2003

Neuroscience Day

From brain to behavior: a unified framework for understanding optimization, reward and decision-making
Jonathan Cohen
2:00pm|Dilworth Room
May
13
2003

Neuroscience Day

Neural mechanisms of response optimization:from spikes to drift-diffusion processes
Phil Holmes
2:45pm|Dilworth Room
May
13
2003

Neuroscience Day

Synchrony, synaptic depression and enhancing signal propagation in the brain
Carson Chow
4:00pm|Dilworth Room

New Connections of Representation Theory to Algebraic Geometry and Physics

Non-equilibrium Dynamics and Random Matrices

Sep
20
2013

Non-equilibrium Dynamics and Random Matrices

Universal current fluctuations in non equilibrium systems
Bernard Derrida
4:00pm|S-101

Fluctuations of the current of one dimensional non equilibrium diffusive systems are well understood. After a short review of the one dimensional results, the talk will try to show that the statistics of these fluctuations are exactly the same in...

Sep
26
2013

Non-equilibrium Dynamics and Random Matrices

Kinetic transport in quasicrystals
Jens Marklof
11:00am|West Bldg. Lect. Hall

Previous studies of kinetic transport in the Lorentz gas have been limited to cases where the scatterers are distributed at random (e.g. at the points of a spatial Poisson process) or at the vertices of a Euclidean lattice. In this talk I will...

Oct
03
2013

Non-equilibrium Dynamics and Random Matrices

Disorder-generated multifractals and random matrices: freezing phenomena and extremes
Yan Fyodorov
11:00am|S-101

I will start with discussing the relation between a class of disorder-generated multifractals and logarithmically-correlated random fields and processes. An important example of the latter is provided by the so-called "\(1/f\) noise" which, in...

Oct
08
2013

Non-equilibrium Dynamics and Random Matrices

Macdonald processes I
2:00pm|S-101

Our goal is to explain how certain basic representation theoretic ideas and constructions encapsulated in the form of Macdonald processes lead to nontrivial asymptotic results in various `integrable'; probabilistic problems. Examples include dimer...

Oct
09
2013

Non-equilibrium Dynamics and Random Matrices

Macdonald processes II
2:00pm|S-101

Our goal is to explain how certain basic representation theoretic ideas and constructions encapsulated in the form of Macdonald processes lead to nontrivial asymptotic results in various `integrable'; probabilistic problems. Examples include dimer...

Oct
15
2013

Non-equilibrium Dynamics and Random Matrices

Dynamical phase transitions, eigenstate thermalization, and Schrodinger cats within the ferromagnetic phase of an infinite-range quantum Ising model
David A. Huse
2:00pm|S-101

An isolated quantum many-body system may be a reservoir that thermalizes its constituents. I will explore an example of the interplay of this thermalization and spontaneous symmetry-breaking, in the ferromagnetic phase of an infinite-range quantum...

Oct
16
2013

Non-equilibrium Dynamics and Random Matrices

Some inter-relations between random matrix ensembles
Forrester, Peter
2:00pm|S-101

In the early 1960's Dyson and Mehta found that the CSE relates to the COE. I'll discuss generalizations as well as other settings in random matrix theory in which \(\beta\) relates to \(4/\beta\).

Oct
17
2013

Non-equilibrium Dynamics and Random Matrices

Spectral theory for the \(q\)-Boson particle system
11:00am|S-101

We develop spectral theory for the generator of the \(q\)-Boson particle system. Our central result is a Plancherel type isomorphism theorem for this system; it implies completeness of the Bethe ansatz in infinite volume and enables us to solve...

Oct
23
2013

Non-equilibrium Dynamics and Random Matrices

Spectral Properties of the Quantum Random Energy Model
2:00pm|S-101

The quantum random energy model is a random matrix of Schroedinger type: a Laplacian on the hypercube plus a random potential. It features in various contexts from mathematical biology to quantum information theory as well as an effective...

Oct
24
2013

Non-equilibrium Dynamics and Random Matrices

Diffusion from deterministic dynamics
11:00am|S-101

I discuss a renormalization group method to derive diffusion from time reversible quantum or classical microscopic dynamics. I start with the problem of return to equilibrium and derivation of Brownian motion for a quantum particle interacting with...

Oct
30
2013

Non-equilibrium Dynamics and Random Matrices

Gap probabilities and applications to geometry and random topology
Antonio Lerario
4:30pm|S-101

What is the volume of the set of singular symmetric matrices of norm one? What is the probability that a random plane misses this set? What is the expected "topology" of the intersection of random quadric hypersurfaces? In this talk I will combine...

Oct
31
2013

Non-equilibrium Dynamics and Random Matrices

Linear statistics of eigenvalues
Kurt Johansson
2:00pm|S-101

The study of the Gaussian limit of linear statistics of eigenvalues of random matrices and related processes, like determinantal processes, has been an important theme in random matrix theory. I will review some results starting with the strong...

Nov
12
2013

Non-equilibrium Dynamics and Random Matrices

Covariance Matrix Estimation for the Cryo-EM Heterogeneity Problem
Singer, Amit
2:00pm|S-101

In cryo-electron microscopy (cryo-EM), a microscope generates a top view of a sample of randomly-oriented copies of a molecule. The cryo-EM problem is to use the resulting set of noisy 2D projection images taken at unknown directions to reconstruct...