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FEBRUARY 2007 |
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Sato-Tate Seminar |
Topic: |
Galois-theoretic properties of the Dwork family |
Presenter: |
Brian Conrad, University of Michigan and Columbia University |
Date: |
Wednesday, February 14, 2007, Time: 1:30 p.m., Location: Fine 314 |
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Discrete Mathematics Seminar |
Topic: |
Problems in additive number theory |
Presenter: |
Melvyn Nathanson, City University of New York |
Date: |
Wednesday, February 14, 2007, Time: 2:15 p.m., Location: Fine 224 |
Abstract: |
See http://www.math.princeton.edu/~bsudakov/nathanson2007-spring.pdf |
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Department Colloquium |
Topic: |
Recent trends in optimal transport |
Presenter: |
Cedric Villani, Ecole Normale Superieure de Lyon |
Date: |
Wednesday, February 14, 2007, Time: 4:30 p.m., Location: Fine 314 |
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Ergodic Theory and Statistical Mechanics Seminar |
Topic: |
Some remarks on the Navier-Stokes system |
Presenter: |
Dong Li, Institute for Advanced Study |
Date: |
Thursday, February 15, 2007, Time: 2:00 p.m., Location: Fine 401 |
Abstract: |
The talk will consist of two parts. In the first part I shall prove a limit theorem for some nonlinear recurrent relation appearing from the analysis of Navier-Stokes system. In the second part I shall review the recent paper by P. Polacik and V. Sverak. |
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Topology Seminar |
Topic: |
1-relator groups and Heegaard splittings |
Presenter: |
Joe Masters, SUNY - Buffalo |
Date: |
Thursday, February 15, 2007, Time: 4:30 p.m., Location: Fine 314 |
Abstract: |
We show that if M is a compact, orientable 3-manifold which fibers over the circle, then every 1-relator presentation of \pi_1 M is induced by a Heegaard splitting of M. |
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Differential Geometry and Geometric Analysis Seminar |
Topic: |
Some Liouville theorem and gradient estimate |
Presenter: |
YanYan Li, Rutgers University |
Date: |
Friday, February 16, 2007, Time: 3:00 p.m., Location: Fine 314 |
Abstract: |
The classical Liouville theorem says that a positive entire harmonic function must be a constant. We give a fully nonlinear version of it. This extension enables us to establish local gradient estimates of solutions to general conformally invariant fully nonlinear elliptic equations of second order. This talk will start from a proof of the classical Liouville theorem using only the comparison principle and the invariance of harmonicity under Mobius transformations and scalar multiplications. We will then outline the proof of the comparison principle used in establishing the new Liouville theorem. Finally we outline the proof of the gradient estimates via the Liouville theorem. |
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PACM Colloquium |
Topic: |
Averaging of ordinary differential equations revisited |
Presenter: |
Zvi Artstein, Mathematics and Computer Science, The Weizmann Institute of Science |
Date: |
Monday, February 19, 2007, Time: 4:00 p.m., Location: Fine 214 |
Abstract: |
The Averaging Method replaces a time-varying perturbation of a differential equation by a time-invariant one, while introducing only a relatively small error. The origin of the method goes back to calculations of stellar orbits; it has many modern applications in both modeling and numerical issues. A variety of mathematical tools have been developed in order to derive accurate estimates of the resulting errors. A new estimation criterion will be offered, which is based on rather "soft" estimates, namely, carrying out a comparison of integrals on a fast time scale. If, in addition, Young measures are employed, the method allows a natural extension to control systems, and carrying out the averaging in an environment with slowly moving averages.
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Mathematical Physics Seminar |
Topic: |
Aperiodic order and pure point diffraction |
Presenter: |
Daniel Lenz, TU Chemnitz |
Date: |
Tuesday, February 20, 2007, Time: 4:30 p.m., Location: Jadwin 343 |
Abstract: |
We give an introduction into the mathematical diffraction theory of aperiodic order. We then focus on the relationship between the diffraction spectrum and the spectrum of the associated dynamical system. Finally, we discuss a method of calculating intensities of Bragg peaks via a Wiener/Wintner type ergodic theorem. Part of this talk is based on joint work with Michael Baake and Nicolae Strungaru respectively. |
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Operations Research and Financial Engineering Seminar |
Topic: |
Modern large-scale significance testing |
Presenter: |
John Storey, Biostatics and Genome Sciences, University of Washington |
Date: |
Tuesday, February 20, 2007, Time: 4:30 p.m., Location: E-219, E-Quad |
Abstract: |
Traditionally, "multiple hypothesis testing" has been concerned with considering just a handful of statistical hypothesis tests simultaneously by adjusting their respective p-values. In recent years, the ability to collect massive data sets in a variety of scientific fields has radically changed this area. We are now often faced with testing thousands or millions of related statistical hypotheses from a single study. In this talk, I will present recent work where we have developed theory and methods to address (1) how one assesses statistical significance in these large-scale studies, (2) how to borrow information across tests to optimally capture the signal of interest, and (3) how to properly deal with large-scale dependence across tests from sources other than the signal of interest. I will illustrate these developments on problems in genomics, particularly focusing on characterizing biologically relevant changes in gene expression from DNA microarray experiments. I will also connect these developments to some classical ideas in statistics. |
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Discrete Mathematics Seminar |
Topic: |
Counting connected graphs via Erdös magic |
Presenter: |
Joel Spencer, NYU |
Date: |
Wednesday, February 21, 2007, Time: 2:15 p.m., Location: Fine 224 |
Abstract: |
See http://www.math.princeton.edu/~bsudakov/spencer2007-spring.pdf |
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Geometry, Representation Theory, and Moduli Seminar |
Topic: |
TBA |
Presenter: |
Maryam Mirzakhani, Princeton University |
Date: |
Wednesday, February 21, 2007, Time: 3:00 p.m., Location: Fine 214 |
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Department Colloquium |
Topic: |
A game interpretation of curvature flows and other nonlinear PDE's |
Presenter: |
Sylvia Serfaty, New York University |
Date: |
Wednesday, February 21, 2007, Time: 4:30 p.m., Location: Fine 314 |
Abstract: |
Mean curvature flow is the motion of a curve (or hupersurface) with normal velocity equal to its mean curvature. In a joint work with Robert Kohn, we showed how an elementary two-person deterministic game converges to the viscosity solution of the mean curvature equation (in level set formulation). This gives a parallel to the optimal control interpretation of first order Hamilton-Jacobi equations. In recent progress, we are able to find analogous interpretations for all parabolic and elliptic nonlinear PDEs. I should add that the abstract has many technical words, but the talk is quite easy to follow for anyone with a very basic knowledge of PDEs (and maybe even for those who don't have it...) |
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Ergodic Theory and Statistical Mechanics Seminar |
Topic: |
The two-dimensional Ising model and Stochastic Loewner Evolution |
Presenter: |
Valentina Riva, Institute for Advanced Study |
Date: |
Thursday, February 22, 2007, Time: 2:00 p.m., Location: Fine 401 |
Abstract: |
I will introduce Stochastic Loewner Evolution by illustrating its application to the two-dimensional Ising model. |
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Princeton University and Institute for Advanced Study Number Theory Seminar |
Topic: |
On the Computation of p-adic Height Pairings on Jacobians of hyperelliptic Curves |
Presenter: |
Amnon Besser, Ben-Gurion University, Israel |
Date: |
Thursday, February 22, 2007, Time: 4:30 p.m., Location: SH-101 |
Abstract: |
p-adic height pairings are analogues of the real height pairings that show up for example in the Birch-Swinnerton Dyer conjectures on special values of L-functions of Abelian varieties. The p-adic pairings show up when one tries to formulate p-adic analogues of these conjectures. The work of Mazur, Stein and Tate from two years ago gives a managable algorithm for computing this pairing on elliptic curves. The talk will present an algorithm for the computation of p-adic height pairings on hyperelliptic curves over number fields. Our work is not directly related to the work of Mazur Stein and Tate, though there are some similarities in the difficulties that occur and in the use of Kedlaya's algorithm. I will first explain where this height pairing arise, and how it decomposes into a sum of local terms at the places of the field. The most interesting is for places above the prime p. We use a description of these local terms given by Coleman and Gross that uses the theory of Coleman integration that I will also sketch. I will also review how one computes Coleman integrals using Kedlaya's algorithm and explain some of the tricks that are used to complete the computation at these primes. Finally I will discuss the situation at other primes, where there are still some delicate issues to resolve. |
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Differential Geometry and Geometric Analysis Seminar |
Topic: |
TBA |
Presenter: |
Rosa Sena-Dias, MIT and IST |
Date: |
Friday, February 23, 2007, Time: 3:00 p.m., Location: Fine 314 |
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Analysis Seminar |
Topic: |
TBA |
Presenter: |
Michael Weinstein, Columbia University |
Date: |
Monday, February 26, 2007, Time: 4:00 p.m., Location: Fine 110 |
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PACM Colloquium |
Topic: |
A Taste of Compressed Sensing |
Presenter: |
Ron DeVore, Courant Institute, New York University |
Date: |
Monday, February 26, 2007, Time: 4:00 p.m., Location: Fine 214 |
Abstract: |
The usual paradigm for encoding signals is based on the Shannon sampling theorem. If the signal is broad-banded then this requires a high sampling rate even though the information content in the signal may be small. Compressed Sensing is an attempt to get out of this dilemma and sample at close to the information rate. The fact that this may be possible is embedded in some old mathematical results in functional analysis, geometry and approximation. This talk will be an excursion into these topics which will focus on the relation between the number of samples we take of a signal and how well we can approximate the signal. It will take place in the discrete setting for vectors in Euclidean space. The talk should be understandable to graduate students and non specialists.
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Algebraic Geometry Seminar |
Topic: |
TBA |
Presenter: |
Luc Illusie, Université Paris-Sud and IAS |
Date: |
Tuesday, February 27, 2007, Time: 4:30 p.m., Location: Fine 322 |
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Discrete Mathematics Seminar |
Topic: |
Graphs and games: every dense graph has a large Surplus |
Presenter: |
Jozsef Beck, Rutgers University |
Date: |
Wednesday, February 28, 2007, Time: 2:15 p.m., Location: Fine 224 |
Abstract: |
See http://www.math.princeton.edu/~bsudakov/beck2007-spring.pdf |
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MARCH 2007 |
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Ergodic Theory and Statistical Mechanics Seminar |
Topic: |
On the connection between Stochastic Loewner Evolution and Conformal Field Theory |
Presenter: |
Valentina Riva, Institute for Advanced Study |
Date: |
Thursday, March 1, 2007, Time: 2:00 p.m., Location: Fine 401 |
Abstract: |
I will discuss the relation between Stochastic Loewner Evolution and Conformal Field Theory with examples from the Potts model and self avoiding walks. |
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Differential Geometry and Geometric Analysis Seminar |
Topic: |
TBA |
Presenter: |
Brian Weber, University of Wisconsin |
Date: |
Friday, March 2, 2007, Time: 3:00 p.m., Location: Fine 314 |
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Analysis Seminar |
Topic: |
TBA |
Presenter: |
Jan Metzger, Stanford University |
Date: |
Monday, March 5, 2007, Time: 4:00 p.m., Location: Fine 110 |
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PACM Colloquium |
Topic: |
Linear stability of ring systems |
Presenter: |
Robert Vanderbei, ORFE & PACM, Princeton University |
Date: |
Monday, March 5, 2007, Time: 4:00 p.m., Location: Fine 214 |
Abstract: |
(Co-author: Egemen Kolemen) We give a self-contained modern linear stability analysis of a system of n equal mass bodies in circular orbit about a single more massive body. Starting with the mathematical description of the dynamics of the system, we form the linear approximation, compute all of the eigenvalues of the linear stability matrix, and finally derive inequalities that guarantee that none of these eigenvalues have positive real part. In the end, we rederive the result that J.C. Maxwell found for large n in his seminal paper on the nature and stability of Saturn’s rings, which was published 150 years ago. In addition, we identify the exact matrix that defines the linearized system even when n is not large. This matrix is then investigated numerically (by computer) to find stability inequalities. Furthermore, using properties of circulant matrices, the eigenvalues of the large 4n×4n matrix can be computed by solving n quartic equations, which further facilitates the investigation of stability. Finally, we have implemented an n-body simulator and we verify that the threshold mass ratios that we derived mathematically or numerically do indeed identify the threshold between stability and instability. Throughout the paper we consider only the planar n-body problem so that the analysis can be carried out purely in complex notation, which makes the equations and derivations more compact, more elegant and therefore, we hope, more transparent. The result is a fresh analysis that shows that these systems are always unstable for 2 <= n <= 6 and for n > 6 they are stable provided that the central mass is massive enough. We give an explicit formula for this mass-ratio threshold.
The full paper is posted here: orfe.princeton.edu/~rvdb/tex/saturn/ms.pdf (PDF)
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Algebraic Geometry Seminar |
Topic: |
TBA |
Presenter: |
Jason Starr, SUNY Stony Brook and MIT |
Date: |
Tuesday, March 6, 2007, Time: 4:30 p.m., Location: Fine 322 |
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Operations Research and Financial Engineering Seminar |
Topic: |
A Filtering Approach to Tracking Volatility from Prices Observed at Random Times |
Presenter: |
Boris Rozovsky, Brown University |
Date: |
Tuesday, March 6, 2007, Time: 4:30 p.m., Location: E-219, E-Quad |
Abstract: |
See http://orfe.princeton.edu/papers/rozovsky-abstract.pdf |
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Discrete Mathematics Seminar |
Topic: |
Sum-product and applications |
Presenter: |
Jean Bourgain, IAS |
Date: |
Wednesday, March 7, 2007, Time: 2:15 p.m., Location: Fine 224 |
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Geometry, Representation Theory, and Moduli Seminar |
Topic: |
TBA |
Presenter: |
R. Thomas, Imperial College |
Date: |
Wednesday, March 7, 2007, Time: 3:00 p.m., Location: Fine 214 |
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Department Colloquium |
Topic: |
TBA |
Presenter: |
Jason Starr, SUNY Stony Brook and MIT |
Date: |
Wednesday, March 7, 2007, Time: 4:30 p.m., Location: Fine 314 |
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Ergodic Theory and Statistical Mechanics Seminar |
Topic: |
Baby-talk on Sato-Tate problem |
Presenter: |
Nicholas Katz, Princeton University |
Date: |
Thursday, March 8, 2007, Time: 2:00 p.m., Location: Fine 401 |
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Differential Geometry and Geometric Analysis Seminar |
Topic: |
TBA |
Presenter: |
Nicos Kapouleas, Brown University |
Date: |
Friday, March 9, 2007, Time: 3:00 p.m., Location: Fine 314 |
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PACM Colloquium |
Topic: |
Patterns of Turbulence |
Presenter: |
Dwight Barkley, Mathematics, University of Warwick |
Date: |
Monday, March 12, 2007, Time: 4:00 p.m., Location: Fine 214 |
Abstract: |
Plane Couette flow -- the flow between two infinite parallel plates moving in opposite directions -- undergoes a discontinuous transition from laminar flow to turbulence as the Reynolds number is increased. Due to its simplicity, this flow has long served as one of the canonical examples for understanding shear turbulence and the subcritical transition process typical of channel and pipe flows. Only recently was it discovered in very large aspect ratio experiments that this flow also exhibits remarkable pattern formation near transition. Steady, spatially periodic patterns of distinct regions of turbulent and laminar flow emerges spontaneously from uniform turbulence as the Reynolds number is decreased. The length scale of these patterns is more than an order of magnitude larger than the plate separation. It now appears that turbulent-laminar patterns are inevitable intermediate states on the route from turbulent to laminar flow in many shear flows. I will explain how we have overcome the difficulty of simulating these large scale patterns and show results from studies of three types of patterns: periodic, localized, and intermittent. |
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Algebraic Geometry Seminar |
Topic: |
TBA |
Presenter: |
Stephen Lichtenbaum, Brown University |
Date: |
Tuesday, March 13, 2007, Time: 4:30 p.m., Location: Fine 322 |
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Operations Research and Financial Engineering Seminar |
Topic: |
Equi-energy sampler: From statistical inference to protein folding |
Presenter: |
Samuel Kou, Department of Statistics, Harvard University |
Date: |
Tuesday, March 13, 2007, Time: 4:30 p.m., Location: E-219, E-Quad |
Abstract: |
We introduce a new sampling algorithm, the equi-energy sampler, for efficient statistical sampling and estimation. Complementary to the widely used temperature-domain methods, the equi-energy sampler, utilizing the temperature-energy duality, targets the energy directly. The focus on the energy function not only facilitates efficient sampling, but also provides a powerful means for statistical estimation, for example, the calculation of the density of states and microcanonical averages in statistical mechanics. The equi-energy sampler is applied to a variety of problems, including exponential regression in statistics, motif sampling in computational biology, and protein folding.
This work is joint with Qing Zhou and Wing Wong. |
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Department Colloquium |
Topic: |
TBA |
Presenter: |
Pavel Bleher, Indiana University and Purdue University, Indianapolis |
Date: |
Wednesday, March 14, 2007, Time: 4:00 p.m., Location: Fine 314 |
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Ergodic Theory and Statistical Mechanics Seminar |
Topic: |
Large N asymptotics in random matrix models |
Presenter: |
Pavel Bleher, Indiana University and Purdue University Indianapolis |
Date: |
Thursday, March 15, 2007, Time: 2:00 p.m., Location: Fine 401 |
Abstract: |
We review recent results and methods on the large N asymptotics in unitary ensembles of random matrices. The main results concern with the universal scaling limits of eigenvalue correlation functions in the bulk of the spectrum, at the edge points, and at the critical points. We discuss the powerful Riemann-Hilbert approach to the problem. |
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Analysis Seminar |
Topic: |
TBA |
Presenter: |
Ovidiu Savin, Columbia University |
Date: |
Monday, March 26, 2007, Time: 4:00 p.m., Location: Fine 110 |
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PACM Colloquium |
Topic: |
Modeling Science: Topic models of Scientific Journals and Other Large Text Databases |
Presenter: |
David Blei, Computer Science, Princeton University |
Date: |
Monday, March 26, 2007, Time: 4:00 p.m., Location: Fine 214 |
Abstract: |
A surge of recent research in machine learning and statistics has developed new techniques for finding patterns of words in document collections using hierarchical probabilistic models. These models are called "topic models" because the word patterns often reflect the underlying topics that are combined to form the documents; however topic models also naturally apply also such data as images and biological sequences.
After reviewing the basics of topic modeling, I will describe two related lines of research in this field, which extend the current state of the art.
First, I will describe probabilistic models designed to capture the dynamics of topics as they evolve over time. Many document collections change over time: scientific articles, emails, and search queries reflect evolving content, and it is important to model the corresponding evolution of the underlying topics.
Second, I will describe a probabilistic topic model which can capture correlations between the hidden topics. Previous models assume that the occurrence of the different topics are independent. In many document collections, however, the presence of a topic may be correlated with the presence of another. For example, a document about sports is more likely to also be about health than international finance.
In addition to giving quantitative, predictive models of a corpus, topic models provide a qualitative window into the structure of a large document collection. This allows a user to explore a corpus in a topic-guided fashion. I will demonstrate the capabilities of these new models on the archives of the journal Science, founded in 1880 by Thomas Edison. The models are built on the noisy text from JSTOR, an online scholarly journal archive, resulting from an optical character recognition engine run over the original bound journals.
(joint work with M. Jordan, A. Ng, and J. Lafferty)
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Algebraic Geometry Seminar |
Topic: |
Desingularization of quasi-excellent Q-schemes |
Presenter: |
Michael Temkin, University of Pennsylvania |
Date: |
Tuesday, March 27, 2007, Time: 4:30 p.m., Location: Fine 322 |
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Differential Geometry and Geometric Analysis Seminar |
Topic: |
TBA |
Presenter: |
Simon Brendle, Stanford University |
Date: |
Friday, March 30, 2007, Time: 3:00 p.m., Location: Fine 314 |
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APRIL 2007 |
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Analysis Seminar |
Topic: |
TBA |
Presenter: |
Becca Thomases, Courant Institute |
Date: |
Monday, April 2, 2007, Time: 4:00 p.m., Location: Fine 110 |
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PACM Colloquium |
Topic: |
TBA |
Presenter: |
Frans Pretorius, Physics, University of Alberta |
Date: |
Monday, April 2, 2007, Time: 4:00 p.m., Location: Fine 214 |
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Algebraic Geometry Seminar |
Topic: |
TBA |
Presenter: |
Junecue Suh, Princeton University |
Date: |
Tuesday, April 3, 2007, Time: 4:30 p.m., Location: Fine 322 |
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Department Colloquium |
Topic: |
TBA |
Presenter: |
Edward Frenkel, UC Berkeley |
Date: |
Wednesday, April 4, 2007, Time: 4:30 p.m., Location: Fine 314 |
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Operations Research and Financial Engineering Seminar |
Topic: |
TBA |
Presenter: |
Rama Cont, Columbia University |
Date: |
Wednesday, April 4, 2007, Time: 4:30 p.m., Location: E-219, E-Quad |
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Analysis Seminar |
Topic: |
TBA |
Presenter: |
Jared Wunsch, Northwestern University |
Date: |
Monday, April 9, 2007, Time: 4:00 p.m., Location: Fine 110 |
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PACM Colloquium |
Topic: |
TBA |
Presenter: |
Jason W. Fleischer, Electrical Engineering, Princeton University |
Date: |
Monday, April 9, 2007, Time: 4:00 p.m., Location: Fine 214 |
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Algebraic Geometry Seminar |
Topic: |
TBA |
Presenter: |
Jacob Lurie, Harvard and AIM |
Date: |
Tuesday, April 10, 2007, Time: 4:30 p.m., Location: Fine 322 |
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Operations Research and Financial Engineering Seminar |
Topic: |
TBA |
Presenter: |
Paul Dupuis, Brown University |
Date: |
Tuesday, April 10, 2007, Time: 4:30 p.m., Location: E-219, E-Quad |
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Discrete Mathematics Seminar |
Topic: |
TBA |
Presenter: |
David Gamarnik, MIT |
Date: |
Wednesday, April 11, 2007, Time: 2:15 p.m., Location: Fine 224 |
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Department Colloquium |
Topic: |
TBA |
Presenter: |
Curtis T McMullen, Harvard University |
Date: |
Wednesday, April 18, 2007, Time: 4:30 p.m., Location: Fine 314 |
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PACM Colloquium |
Topic: |
Heterogeneous Lipid Bilayers: Evolving Microstructures in Biology |
Presenter: |
Mikko Haataja, MAE, Princeton University |
Date: |
Monday, April 23, 2007, Time: 4:00 p.m., Location: Fine 214 |
Abstract: |
The design and processing of materials with novel physical and mechanical properties requires a fundamental understanding of the connections between processing, microstructure, and properties. For example, mechanical properties in pure metals and alloys can be varied by manipulating the polycrystalline grain size or the size of the compositional domains through heat treatment, while elastic strain provides a way to tune the optical properties of self-assembled quantum dots during growth. In an analogous manner, the biological function of cell membranes is strongly affected by the details of the local "microstructure".
Typically, microstructural evolution takes place across multiple length and time scales, ranging from atomistic to mesoscopic ones. In this talk I will describe our recent efforts in developing physically-based, coarse-grained continuum models, which bridge the atomistic and mesoscopic scales, to elucidate lateral organization and non-equilibrium dynamics of heterogeneous lipid bilayers. In particular, I will focus on spatially organized, dynamic heterogeneities in the local lipid composition ("lipid rafts") which have been implicated in many important cellular processes including signal transduction, membrane trafficking, cytoskeleton organization, and pathogen entry. |
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Algebraic Geometry Seminar |
Topic: |
TBA |
Presenter: |
David Harbater, University of Pennsylvania |
Date: |
Tuesday, April 24, 2007, Time: 4:30 p.m., Location: Fine 322 |
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Operations Research and Financial Engineering Seminar |
Topic: |
TBA |
Presenter: |
Andreas Hamel, Princeton University |
Date: |
Tuesday, April 24, 2007, Time: 4:30 p.m., Location: E-219, E-Quad |
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Discrete Mathematics Seminar |
Topic: |
TBA |
Presenter: |
Assaf Naor, NYU |
Date: |
Wednesday, April 25, 2007, Time: 2:15 p.m., Location: Fine 224 |
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MAY 2007 |
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Operations Research and Financial Engineering Seminar |
Topic: |
TBA |
Presenter: |
Rong Chen, University of Illinois at Chicago |
Date: |
Tuesday, May 1, 2007, Time: 4:30 p.m., Location: E-219, E-Quad |
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Department Colloquium |
Topic: |
TBA |
Presenter: |
Tamar Ziegler, University of Michigan |
Date: |
Wednesday, May 2, 2007, Time: 4:30 p.m., Location: Fine 314 |
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Operations Research and Financial Engineering Seminar |
Topic: |
TBA |
Presenter: |
Frank Heyde, MLU Halle-Wittenberg |
Date: |
Tuesday, May 8, 2007, Time: 4:30 p.m., Location: E-219, E-Quad |
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