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FEBRUARY 8 - 10, 2006 |
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|
| Department Colloquium |
| Topic: |
Tropical geometry |
| Presenter: |
Grisha Mikhalkin, University of Toronto |
| Date: |
Wednesday, February 8, 2006, Time: 4:30 p.m., Location: Fine Hall 314 |
| Abstract: |
Tropical geometry can be viewed as an art of manipulating with certain piecewise-linear objects that take over the role of classical algebraic varieties. The talk surveys basic concepts of tropical geometry as well as its applications for some classical geometric problems. |
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| Topology Seminar |
| Topic: |
Holes in the disk complex |
| Presenter: |
Saul Schleimer, Rutgers University |
| Date: |
Thursday, February 9, 2006, Time: 4:30 p.m., Location: Fine Hall 314 |
| Abstract: |
An alternative title might be "Why is it so hard to make two disks in a handlebody disjoint?" The metric geometry of the disk complex gives an answer. The tools we require are a bit of JSJ theory and a lot of the hierarchy machine introduced by Masur and Minsky. This is joint work with Howard Masur. |
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|
| COLUMBIA-PRINCETON UNIVERSITY PROBABILITY DAY |
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| Topic: |
On the timing option in a futures contract |
| Presenter: |
Tomas Björk, Stockholm School of Economics
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| Topic: |
On the interior smoothness of harmonic functions for degenerate diffusion processes |
| Presenter: |
Nicolai Krylov, University of Minnesota |
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| Topic: |
The Andersen thermostat in molecular dynamics |
| Presenter: |
Dong Li, Princeton University |
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| Topic: |
The heat kernel at the cut locus with connections to Brownian motions |
| Presenter: |
Robert Neel, Columbia University |
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|
| Date: |
Friday, February 10, 2006, Time: 10:00 a.m., Location: Columbia University, Department of Mathematics, Room 312 |
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|
| Geometric Analysis Seminar |
| Topic: |
The Spacelike Stability of the Isotropic Friedmann Model |
| Presenter: |
Christina Sormani,
City University of New York |
| Date: |
Friday, February 10, 2006, Time: 3:00 p.m., Location: Fine Hall 314 |
| Abstract: |
In the Friedmann Model of the universe, cosmologists assume that spacelike slices of the universe are Riemannian manifolds of constant
sectional curvature. This assumption is justified via Schur's Theorem by stating that the spacelike universe is locally isotropic. Here we define a Riemannian manifold as almost locally isotropic in a sense which allows both weak gravitational lensing in all directions and
strong gravitational lensing in localized angular regions. We then prove that such a manifold is Gromov Hausdorff close to a length space $Y$ which is a collection of space forms joined at discrete points. Within the paper we define a concept we call an "exponential length space'' and prove that if such a space is locally isotropic then it is a space form. |
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|
| Ergodic Theory and Statistical Mechanics Seminar |
| Topic: |
Advanced statistical properties of dispersing billiards |
| Presenter: |
Nikolai Chernov, University of Alabama at Birmingham |
| Date: |
Friday, February 10, 2006, Time: 3:30 p.m., Location: Fine Hall 322 |
| Abstract: |
A new approach to the studies of statistical properties of hyperbolic dynamical systems (based on coupling method borrowed from probability theory) emerged recently; it was introduced by L.-S. Young and modified by D. Dolgopyat. We apply it here to Sinai billiards to derive a series of new results. First we establish sharp bounds on correlations (including multiple correlations). Then we use our correlation bounds to obtain the central limit theorem (CLT), the almost sure invariance principle (ASIP), the law of iterated logarithms, and integral tests. |
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| Ergodic Theory and Statistical Mechanics Seminar |
| Topic: |
Limit laws and recurrence for the infinite horizon planar Lorentz process |
| Presenter: |
Domokos Szász, Technical University Budapest |
| Date: |
Friday, February 10, 2006, Time: 4:30 p.m., Location: Fine Hall 322 |
| Abstract: |
L. S. Young's 1998 tower construction provided exponential decay or correlations for Hölder functions for 2-D hyperbolic systems with singularities and as a consequence a CLT, for instance. Our interest is to develop further the probabilistic methods, in particular, those based on the Fourier-transform of the Perron-Frobenius operator in order to obtain more delicate probabilistic properties. The methods are also hoped to lead to a potential theory of 2-D periodic Lorentz processes. |
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FEBRUARY 13 -17, 2006 |
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|
| Algebraic Geometry Seminar ***Note special date, time and location |
| Topic: |
Torelli map and infinite grassmannians |
| Presenter: |
V. Alexeev, University of Georgia |
| Date: |
Monday, February 13, 2006, Time: 1:30 p.m., Location: Fine Hall 401 |
| Abstract: |
I will explain how the Torelli map M_g->A_g can be viewed as the "Chow quotient" of the Plucker embedding of the "infinite periodic" grassmanian Gr(2,infty). This, of course, immediately reminds one of the "more infinite" Sato grassmanian Gr(infty, infty/2) and Shiota's characterization of the Schottky locus in terms of KP equation. I will touch on the connection between the two constructions. |
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|
| Mathematics Seminar |
| Topic: |
Classical invariant theory meets statistics |
| Presenter: |
A. Neeman, ANU |
| Date: |
Monday, February 13, 2006, Time: 2:00 p.m., Location: Fine Hall 314 |
| Abstract: |
Mixture models are a venerable old part of statistics, a part which has found extensive applications, especially in biology. There is an enormous literature on the subject going back decades. This rich literature deals primarily with the case where one assumes known the underlying distributions; for example one might assume they are normal. The nonparametric case is largely unexplored. In this talk we will explain a new result, joint with Ryan Elmore and Peter Hall, which uses classical invariant theory to solve the identifiability problem for this model. |
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| PACM Seminar |
| Topic: |
Fault-Tolerant Quantum Computation |
| Presenter: |
Barbara Terhal, IBM |
| Date: |
Monday, February 13, 2006, Time: 4:00 p.m., Location: Fine Hall 214 |
| Abstract: |
I will review the theory of fault-tolerant quantum computation and the use of quantum error-correcting codes in future quantum computers. I will discuss the most recent developments in this area. |
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|
| Math Graduate Student Seminar |
| Topic: |
TBA |
| Presenter: |
Margaret Doig, Princeton University |
| Date: |
Tuesday, February 14, 2006, Time: 12:30 p.m., Location: Fine Hall 224 |
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|
| Algebraic Geometry Seminar |
| Topic: |
Complete moduli of branchvarieties |
| Presenter: |
V. Alexeev, University of Georgia |
| Date: |
Tuesday, February 14, 2006, Time: 4:30 p.m., Location: Fine Hall 322 |
| Abstract: |
I will present a brand new moduli space providing an alternative both to Hilbert scheme and to Chow variety. It classifies reduced varieties with a finite map to a fixed projective variety or scheme. Unlike the Hilbert scheme, only reduced varieties are used. Unlike the Chow variety, infinitesimal families are meaningful, in particular this moduli space has a tangent space. Families of branchvarieties have many more local invariants than families of subschemes. With some basic invariants fixed, the moduli space is proper. (Based on a joint work with A.Knutson) |
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|
| Mathematical Physics Seminar |
| Topic: |
The Riemann-Hilbert Problem: applications |
| Presenter: |
Percy Deift, Courant Institute (NYU) and IAS |
| Date: |
Tuesday, February 14, 2006, Time: 4:30 p.m., Location: Jadwin 343 |
| Abstract: |
The speaker will describe the application of Riemann-Hilbert techniques to a variety of problems in mathematics and mathematical physics. The nonlinear steepest descent method plays a key role. Areas of applications include: random matrix theory and orthogonal polynomials, integrable systems, problems in random permutations, and random particle systems. |
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|
| Operation Research and Financial Engineering Seminar |
| Topic: |
Non-Smooth, Non-Convex Optimization: Theory, Algorithms and Applications |
| Presenter: |
Michael Overton, New York University |
| Date: |
Tuesday, February 14, 2006, Time: 4:30 p.m., Location: Room E-219, Engineering Quad |
| Abstract: |
Theory: there are two standard approaches to generalizing derivatives to nonsmooth, nonconvex optimization: the Clarke subdifferential (or generalized gradient), and the MIRW subdifferential (or subgradient sets),
as expounded in Rockafellar and Wets (Springer, 1998). We briefly discuss
these and mention their advantages and disadvantages. They coincide for an
important class of functions: those that are locally Lipschitz and regular,
which includes continuously differentiable functions and convex functions.
Algorithms: the usual approach is bundle methods, which are complicated. We describe some alternatives: BFGS (a new look at an old method), and Gradient Sampling (a simply stated method that, although computationally intensive, has solved some previously unsolved problems and has a nice convergence theory).
Applications: these abound in control, but surely in other areas too. Of
particular interest to me are applications involving eigenvalues and
singular values of nonsymmetric matrices. Sometimes even easily stated problems in a few variables are hard. Our new code HIFOO (H Infinity Fixed-Order Optimization) is intended for use by practicing control
engineers and has solved some open problems in control.
This is all joint work with James Burke and Adrian Lewis. HIFOO is also
joint with Didier Henrion.
|
| |
|
| Analysis Seminar *** Please note special date and time |
| Topic: |
Spectra of positive and negative energies in the linearized NLS problem |
| Presenter: |
Vitali Vougalter, University of Toronto |
| Date: |
Wednesday, February 15, 2006, Time: 3:00 p.m., Location: Fine Hall 214 |
| Abstract: |
We study the spectrum of the linearized NLS equation in three dimensions in association with the energy spectrum. We prove that unstable eigenvalues of the linearized NLS problem are related to negative eigenvalues of the energy spectrum, while neutrally stable eigenvalues may have both positive and negative energies. The nonsingular part of the neutrally stable essential spectrum is always related to the positive energy spectrum. We derive bounds on the number of unstable eigenvalues of the linearized NLS problem and study bifurcations of embedded eigenvalues of positive and negative energies. |
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|
| Geometry, Representation Theory, and Moduli Seminar |
| Topic: |
Hurwitz numbers, admissible covers and local GW theory |
| Presenter: |
Renzo Cavalieri, Michigan University |
| Date: |
Wednesday, February 15, 2006, Time: 3:00 p.m., Location: Fine Hall 214 |
| Abstract: |
Moduli spaces of Admissible Covers are smooth (as DM stacks) compactifications of the classical Hurwitz schemes, parametrizing ramified covers of Riemann Surfaces with specified numerical invariants and ramification data. Not surprisingly the theory of Hurwitz numbers is strictly related with such spaces. What I intend to present is how this theory in fact extends to a TQFT (Frobenius Algebra) encoding more general intersection numbers on Admissible Cover spaces, and strictly related to (local) Gromov-Witten Theory. The upshot is that Hurwitz numbers and Atyiah-Bott localization allow to compute explicitly generating functions for this theory. |
| |
|
| Department Colloquium |
| Topic: |
Small gaps between primes |
| Presenter: |
Dan Goldston, San Jose State University |
| Date: |
Wednesday, February 15, 2006, Time: 4:30 p.m., Location: Fine Hall 314 |
| Abstract: |
I will describe recent joint work with Janos Pintz and Cem Yildirim on small gaps between primes. One surprising result is that if the primes are well distributed in arithmetic progressions then one can prove results not too far from the twin prime conjecture, for example, if the Elliott-Halberstam conjecture is true then there are infinitely many pairs of primes with difference 16 or less. Unconditionally we prove that there are pairs of primes much closer together than the average distance between consecutive primes.
This work has had its share of media attention, and even generated a song on public television. In my case there has been three stages to this publicity: the enjoyment of small-time public fame for proving the result two years ago, followed closely by the not so enjoyable publicity when the proof crashed, and lastly the redemption following the strange emergence of a new proof. After Wiles this may seem like standard procedure in mathematics, but I would not recommend it for the faint of heart. |
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|
| Ergodic Theory and Statistical Mechanics Seminar |
| Topic: |
Ergodic theory and lattice points |
| Presenter: |
Amos Nevo, Institute for Advanced Study |
| Date: |
Thursday, February 16, 2006, Time: 2:00 p.m., Location: Fine Hall 322 |
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|
| Geometric Analysis Seminar |
| Topic: |
TBA |
| Presenter: |
Natasa Sesum , Columbia University |
| Date: |
Friday, February 17, 2006, Time: 3:00 p.m., Location: Fine Hall 314 |
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FEBRUARY 20 - 24, 2006 |
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|
| PACM Seminar |
| Topic: |
Math Problems from the Far Side of Quantum Information |
| Presenter: |
Christopher A. Fuchs, Bell Labs, Lucent Technologies |
| Date: |
Monday, February 20, 2006, Time: 4:00 p.m., Location: Fine Hall 214 |
| Abstract: |
The field of Quantum Information has recently rightly attracted great interest for the technological fruits it may bear. But there is a sect of its practitioners who think it stands a chance to bring us much more than that---namely, that its theoretical tools will give us a means for exploring what quantum mechanics is really all about and for settling some of the deepest problems in physics. The roots of this optimism come from a very old thought: that a quantum state has more to do with representing its user's information, than any inherent physical property of the system to which it is ascribed. What is new and nice is that quantum information teaches us how to formulate this idea precisely and even check its consistency. Nicer still for the mathematics community is the number of juicy mathematical problems the consistency-checking process poses. In this talk, I will review some of the history of this and then quickly settle on a sample problem that has been annoying me a lot lately: the question of the existence of symmetric informationally complete positive-operator-valued measures for finite dimensional Hilbert spaces. I'm not alone---it turns out to be equivalent to a 30-year-old problem in coding theory---but I will say some things about it that you may not have heard before. |
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|
| Math Graduate Student Seminar |
| Topic: |
TBA |
| Presenter: |
Brian Street, Princeton University |
| Date: |
Tuesday, February 21, 2006, Time: 12:30 p.m., Location: Fine Hall 224 |
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|
| Algebraic Geometry Seminar |
| Topic: |
TBA |
| Presenter: |
R. Donagi, University of Pennsylvania |
| Date: |
Tuesday, February 21, 2006, Time: 4:30 p.m., Location: Fine Hall 322 |
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|
| Mathematical Physics Seminar |
| Topic: |
TBA |
| Presenter: |
W.M. Wang, University of Massachussetts at Amherst |
| Date: |
Tuesday, February 21, 2006, Time: 4:30 p.m., Location: Jadwin 343 |
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|
| Operation Research and Financial Engineering Seminar |
| Topic: |
A relative performance approach to portfolio selection when there is model ambiguity |
| Presenter: |
Andrew Lim, UC Berkeley |
| Date: |
Tuesday, February 21, 2006, Time: 4:30 p.m., Location: Room E-219, Engineering Quad |
| Abstract: |
Recent interest in the topic of "investment with model ambiguity" in the finance, economics and decision theory communities has been motivated largely by efforts to incorporate "ambiguity aversion", as suggested by experiments such as the Ellsberg Paradox, in the analysis of agent behavior. Closely related work on "robust portfolio selection" in the optimization community has been driven by the observation that the solutions of classical optimal portfolio selection problems (such as "mean-variance optimization") are sensitive to statistical errors that can arise during calibration, and that the "real world" performance of such portfolios can be poor if these errors are ignored. The commonly used method for addressing these issues is some sort of "worst case" optimization which has led in turn to methodologies such as "worst case mean-variance" and "worst case utility maximization". While the "worst case approach" has its axiomatic foundations in the work of Gilboa and Schmeidler, it has also been criticized for being "overly pessimistic".
In this talk, we propose and analyze an alternative measure of` "robust performance". This alternative measure differs from the typical "worst case expected utility" and "worst case mean-variance" formulations in that the "robust performance" of a (dynamic) portfolio is evaluated not only on the basis of its performance when there is an adversarial opponent ("nature"), but also by its performance relative to a fully informed ``benchmark investor" who behaves optimally given complete knowledge of the otherwise ambiguous model. This "relative performance" approach has several important properties: (i) decisions arising from this approach are less pessimistic than the portfolios obtained from the typical "worst case expected utility" and "worst case mean-variance" formulations, (ii) the dynamic "relative performance" problem reduces to a convex static optimization problem under reasonable choices of the benchmark portfolio, and (iii) the solution of the "relative performance" problem coincides with that of a "Bayesian" portfolio choice problem with an appropriately chosen prior. The static problem is interesting in its own right: it can be interpreted as a less pessimistic alternative to the single period "worst case mean-variance" problem.
Joint work with J. George Shanthikumar and Thaisiri Watewai. |
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|
| Discrete Mathematics Seminar |
| Topic: |
Discrepancy games |
| Presenter: |
Michael Krivelevich, Tel Aviv University |
| Date: |
Wednesday, February 22, 2006, Time: 2:15 p.m., Location: Fine 224 |
| Abstract: |
See http://www.math.princeton.edu/~bsudakov/krivelevich2005-2006.pdf |
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|
| Geometry, Representation Theory, and Moduli Seminar |
| Topic: |
TBA |
| Presenter: |
A. Zinger, Stony Brook |
| Date: |
Wednesday, February 22, 2006, Time: 3:00 p.m., Location: Fine Hall 214 |
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|
| Department Colloquium |
| Topic: |
Multiple correlations in Ergodic Theory |
| Presenter: |
Bernard Host, Universit´e de Marne la Vall´ee |
| Date: |
Wednesday, February 22, 2006, Time: 4:30 p.m., Location: Fine Hall 314 |
| Abstract: |
Consider a probability space (X,\CB,\mu) endowed with an invertible measure preserving transformation T. This system is "mixing'" if for any sets A,B\in \CB the measure of A\cap T^nB converges to the product \mu(A)\mu(B) when n goes to infinity. It is called `"three fold mixing'" if for any sets A,B,C\in \CB we have \mu(A\cap T^mB \cap T^n C)\to\mu(A)\mu(B)\mu(C)when m and n-m\to+\infty.
Does mixing imply three fold mixing? This question is almost as old as ergodic theory itself and still open. Very little progress has been done until now. I will first present some relatively old results.
This question is related to the notion of `"multicorrelations." If f is a function on X, its `"correlation sequence'' c_n(f):=\int f(x) f(T^nx) d\mu(x) has a nice description as the Fourier transform of a measure. But higher correlation sequences, like c_{m,n}(f):=\int f(x) f(T^mx)f(T^nx) dx, are much less understood. I plan to present a few properties of these sequences. |
| |
|
| Ergodic Theory and Statistical Mechanics Seminar |
| Topic: |
Ergodicity and spectral gaps for degenerately forced stochastic PDEs |
| Presenter: |
J.Mattingly, Duke University |
| Date: |
Thursday, February 23, 2006, Time: 2:00 p.m., Location: Fine Hall 322 |
| |
|
| Geometric Analysis Seminar |
| Topic: |
TBA |
| Presenter: |
Xiaohua Zhu, Beijing University |
| Date: |
Friday, February 24, 2006, Time: 3:00 p.m., Location: Fine Hall 314 |
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|
FEBRUARY 27 - MARCH 3, 2006 |
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|
| PACM Seminar |
| Topic: |
Layering As Optimization Decomposition |
| Presenter: |
Mung Chiang, Electrical Engineering, Princeton University |
| Date: |
Monday, February 27, 2006, Time: 4:00 p.m., Location: Fine Hall 214 |
| Abstract: |
Layered network architecture has traditionally been designed based on engineering heuristics. Recently a mathematically rigorous, practically relevant, and unifying framework has emerged to view the network as a solver of a generalized utility maximization problem, with alternative decompositions of the problem corresponding to different layering schemes, each decomposed subproblem corresponding to a different layer, and functions of variables coordinating the subproblems as the interfaces among the layers. Such decompositions can be carried out both horizontally across geographically disparate network elements and vertically into various functional modules. This talk surveys the recent advances in establishing this framework as a systematic approach to analyze and design protocol stacks in a holistic way that reveals the underlying structures and explores network design alternatives. Connections with distributed subgradient algorithm, convex and nonconvex optimization, stochastic optimization, differential topology, and algebraic geometry will be highlighted. |
| |
|
| Mathematical Physics Seminar |
| Topic: |
TBA |
| Presenter: |
I. Nenciu, Institute for Advanced Study |
| Date: |
Tuesday, February 28, 2006, Time: 4:30 p.m., Location: Jadwin 343 |
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|
| Operation Research and Financial Engineering Seminar |
| Topic: |
TBA |
| Presenter: |
Frank Riedel, Rheinische Friedrich-Wilhelms-Universität Bonn |
| Date: |
Tuesday, February 28, 2006, Time: 4:30 p.m., Location: Room E-219, Engineering Quad |
| |
|
| Discrete Mathematics Seminar |
| Topic: |
Mass distribution in high dimensional convex sets |
| Presenter: |
Boaz Klartag, IAS |
| Date: |
Wednesday, March 1, 2006, Time: 2:15 p.m., Location: Fine 224 |
| Abstract: |
We review some basic properties and discuss several open problems, related to the distribution of volume in general high dimensional convex sets. We will also describe some of the recent developments in the subject. No special prior knowledge will be assumed. |
| |
|
| Geometric Analysis Seminar |
| Topic: |
TBA |
| Presenter: |
Stefan Wenger, Courant Institute, NYU |
| Date: |
Friday, March 3, 2006, Time: 3:00 p.m., Location: Fine Hall 314 |
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|
MARCH 6 -10, 2006 |
| |
|
| PACM Seminar |
| Topic: |
Wireless Sensing, Active Learning and Compressive Sampling |
| Presenter: |
Robert Nowak, Electrical and Computer Engineering, University of Wisconsin-Madison |
| Date: |
Monday, March 6, 2006, Time: 4:00 p.m., Location: Fine Hall 214 |
| Abstract: |
Wireless sensor networks promise a fundamentally new approach for gathering information about the physical environment via a distributed network of sensors that can communicate with each other and/or with a (usually distant) fusion center through radio-frequency wireless links. Limited power resources make energy conservation essential in these envisioned sensing systems. Thus, it becomes crucial to strategically decide when, where and how to collect samples and communicate information. Active learning methods adaptively select samples based on previous observations in order to "learn" a target function using as few samples as possible, which could clearly be advantageous in sensor network operations. Compressive sampling refers to taking non-traditional samples in the form of randomized projections of data. Recent results show that compressive sampling can allow one to reconstruct signals from far fewer samples than required by traditional Shannon-Nyquist sampling schemes, again suggesting promising opportunities for wireless sensing. In this talk I will discuss the theory of active learning and compressive sampling, connections to information and coding theory, and some intriguing potential applications to wireless sensing systems. |
| |
|
| Algebraic Geometry Seminar |
| Topic: |
TBA |
| Presenter: |
A. Marian, Yale University |
| Date: |
Tuesday, March 7, 2006, Time: 4:30 p.m., Location: Fine Hall 322 |
| |
|
| Mathematical Physics Seminar |
| Topic: |
TBA |
| Presenter: |
Jean Bourgain, Institute for Advanced Study |
| Date: |
Tuesday, March 7, 2006, Time: 4:30 p.m., Location: Jadwin 343 |
| |
|
| Operation Research and Financial Engineering Seminar |
| Topic: |
TBA |
| Presenter: |
Diego Klabjan, University of Illinois |
| Date: |
Tuesday, March 7, 2006, Time: 4:30 p.m., Location: Room E-219, Engineering Quad |
| |
|
| Discrete Mathematics Seminar |
| Topic: |
TBA |
| Presenter: |
Eyal Lubetzky, Tel Aviv University |
| Date: |
Wednesday, March 8, 2006, Time: 2:15 p.m., Location: Fine 224 |
| |
|
| Geometry, Representation Theory, and Moduli Seminar |
| Topic: |
TBA |
| Presenter: |
A. Oblomkov, Princeton University and IAS |
| Date: |
Wednesday, March 8, 2006, Time: 3:00 p.m., Location: Fine Hall 214 |
| |
|
| Geometric Analysis Seminar |
| Topic: |
TBA |
| Presenter: |
Christopher B. Croke, University of Pennsylvania |
| Date: |
Friday, March 10, 2006, Time: 3:00 p.m., Location: Fine Hall 314 |
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|
MARCH 13 -14, 2006 |
| |
|
| Mathematical Physics Seminar |
| Topic: |
TBA |
| Presenter: |
A. Okounkov, Princeton University |
| Date: |
Tuesday, March 14, 2006, Time: 4:30 p.m., Location: Jadwin 343 |
| |
|
| Operation Research and Financial Engineering Seminar |
| Topic: |
TBA |
| Presenter: |
Wolfgang Hürdle, Humboldt-Universitüt zu Berlin |
| Date: |
Tuesday, March 14, 2006, Time: 4:30 p.m., Location: Room E-219, Engineering Quad |
| |
|
| Discrete Mathematics Seminar |
| Topic: |
TBA |
| Presenter: |
Oleg Pikhurko, Carnegie Mellon University |
| Date: |
Wednesday, March 15, 2006, Time: 2:15 p.m., Location: Fine 224 |
| |
|
| Geometric Analysis Seminar |
| Topic: |
TBA |
| Presenter: |
Xingwang Xu, National University of Singapore |
| Date: |
Friday, March 17, 2006, Time: 3:00 p.m., Location: Fine Hall 314 |
| |
|
MARCH 20 -25, 2006 |
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|
SPRING BREAK |
| |
|
MARCH 27 -31, 2006 |
| |
|
| PACM Seminar |
| Topic: |
TBA |
| Presenter: |
Scott Rickard, Electronic and Electrical Engineering, University College Dublin |
| Date: |
Monday, March 27, 2006, Time: 4:00 p.m., Location: Fine Hall 214 |
| |
|
| Algebraic Geometry Seminar |
| Topic: |
Nef but not semi-ample line bundles over finite fields |
| Presenter: |
Burt Totaro, Cambridge Univ. |
| Date: |
Tuesday, March 28, 2006, Time: 4:30 p.m., Location: Fine Hall 322 |
| Abstract: |
We give the first example of a nef line bundle L on a smooth projective variety over a finite field such that L is not semi-ample. (That is, no power of L is basepoint-free.) Our examples give a negative answer to a question by Keel. |
| |
|
| Discrete Mathematics Seminar |
| Topic: |
TBA |
| Presenter: |
Tibor Szabo, ETH |
| Date: |
Wednesday, March 29, 2006, Time: 2:15 p.m., Location: Fine 224 |
| |
|
| Geometry, Representation Theory, and Moduli Seminar |
| Topic: |
TBA |
| Presenter: |
K. Costello, Chicago University |
| Date: |
Wednesday, March 29, 2006, Time: 3:00 p.m., Location: Fine Hall 214 |
| |
|
| Geometric Analysis Seminar |
| Topic: |
TBA |
| Presenter: |
Qing Jie, UC Santa Cruz |
| Date: |
Friday, March 31, 2006, Time: 3:00 p.m., Location: Fine Hall 314 |
| |
|
APRIL 3 - 7, 2006 |
| |
|
| Mathematical Physics Seminar |
| Topic: |
TBA |
| Presenter: |
A. Laptev, KTH |
| Date: |
Tuesday, April 4, 2006, Time: 4:30 p.m., Location: Jadwin 343 |
| |
|
| Operation Research and Financial Engineering Seminar |
| Topic: |
TBA |
| Presenter: |
Adrian Lewis, Cornell University |
| Date: |
Tuesday, April 4, 2006, Time: 4:30 p.m., Location: Room E-219, Engineering Quad |
| |
|
| Algebraic Geometry Seminar *** Please note special date |
| Topic: |
TBA |
| Presenter: |
M. Popa, University of Chicago |
| Date: |
Thursday, April 6, 2006, Time: 4:30 p.m., Location: TBA |
| |
|
| Geometric Analysis Seminar |
| Topic: |
TBA |
| Presenter: |
Robert Hardt, Rice University |
| Date: |
Friday, April 7, 2006, Time: 3:00 p.m., Location: Fine Hall 314 |
| |
|
APRIL 10 - 14, 2006 |
| |
|
| PACM Seminar |
| Topic: |
TBA |
| Presenter: |
Lisa Fauci, Mathematics, Tulane University |
| Date: |
Monday, April 10, 2006, Time: 4:00 p.m., Location: Fine Hall 214 |
| |
|
| PACM Seminar ***Note special date |
| Topic: |
From Maxwell demon to Brownian refrigerator |
| Presenter: |
Christian Van den Broeck, Theoretical Physics, Hasselt University, Belgium |
| Date: |
Tuesday, April 11, 2006, Time: 4:00 p.m., Location: Fine Hall 214 |
| Abstract: |
Maxwell was under the impression that it should be possible to violate the second law of thermodynamics provided one could operate on a molecular scale. This comment was the beginning of a discussion stretching over the whole of the 20th century involving outstanding physicists including Smoluchowski, Onsager, Szilard, Feynman and Landauer. The issue has now become of more than academic interest because of recent developments in nanotechnology and molecular biology. We present a simplification of the Feynman ratchet that can be studied in detail by hard disk molecular dynamics and for which an exact microscopic calculation is possible. We will show how this construction can be used as a Brownian motor but also as a Brownian heat pump and refrigerator. |
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| Mathematical Physics Seminar |
| Topic: |
TBA |
| Presenter: |
D. Buchholz, University of Goettingen |
| Date: |
Tuesday, April 11, 2006, Time: 4:30 p.m., Location: Jadwin 343 |
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| Operation Research and Financial Engineering Seminar |
| Topic: |
TBA |
| Presenter: |
Anja Sturm, University of Delaware |
| Date: |
Tuesday, April 11, 2006, Time: 4:30 p.m., Location: Room E-219, Engineering Quad |
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| Geometric Analysis Seminar |
| Topic: |
TBA |
| Presenter: |
Hubert Bray, Duke University |
| Date: |
Friday, April 14, 2006, Time: 3:00 p.m., Location: Fine Hall 314 |
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APRIL 17 - 21, 2006 |
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| PACM Seminar |
| Topic: |
Turbulence and Large-scale Circulation in the Ocean and Atmosphere |
| Presenter: |
Geoff Vallis, Geosciences / Atmospheric & Oceanic Sciences, Princeton University |
| Date: |
Monday, April 17, 2006, Time: 4:00 p.m., Location: Fine Hall 214 |
| Abstract: |
The large-scale circulation is not only affected but is essentially effected by turbulent flows. This turbulence is not the small-scale turbulence that is (unfortunately) sometimes connoted by the word turbulence, but is turbulence up to the scale of the large-scale flow itself. This is largely two-dimensional, so-called geostrophic turbulence. We will discuss what is known and what is unknown about such flow, the problems of both simulating it and of understanding it, and whether these two are the same. |
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| Mathematical Physics Seminar |
| Topic: |
TBA |
| Presenter: |
Y. Peres, University of California, Berkeley |
| Date: |
Tuesday, April 18, 2006, Time: 4:30 p.m., Location: Jadwin 343 |
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| Geometric Analysis Seminar |
| Topic: |
TBA |
| Presenter: |
Mu-Tao Wang, Columbia University |
| Date: |
Friday, April 21, 2006, Time: 3:00 p.m., Location: Fine Hall 314 |
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APRIL 24 - 28, 2006 |
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| Mathematical Physics Seminar |
| Topic: |
TBA |
| Presenter: |
P. Hislop, University of Kentucky |
| Date: |
Tuesday, April 25, 2006, Time: 4:30 p.m., Location: Jadwin 343 |
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