Oct 14, 2019
Monday
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09:15 AM - 09:30 AM
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Welcome
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- Location
- SLMath: Eisenbud Auditorium
- Video
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- Abstract
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- Supplements
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09:30 AM - 10:30 AM
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Loops, Toeplitz operators and representations
Richard Melrose (Massachusetts Institute of Technology)
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- Location
- SLMath: Eisenbud Auditorium
- Video
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- Abstract
One step in the definition of Dirac-Ramond operators on the loop space of a manifold is structure of smooth projective representations of loop groups. The resulting Fr ́echet spaces and central extension can be analyzed in terms of Toeplitz operators on the circle.
- Supplements
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Notes
1.57 MB application/pdf
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10:30 AM - 11:00 AM
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Break
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- Location
- SLMath: Atrium
- Video
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- Abstract
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- Supplements
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11:00 AM - 12:00 PM
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Deformation of spherical conical metrics
Xuwen Zhu (Northeastern University)
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- Location
- SLMath: Eisenbud Auditorium
- Video
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- Abstract
The problem of finding and classifying constant curvature metrics with conical singularities has a long history bringing together several different areas of mathematics. This talk will focus on the particularly difficult spherical case where many new phenomena appear. When some of the cone angles are bigger than $2\pi$, uniqueness fails and existence is not guaranteed; smooth deformation is not always possible and the moduli space is expected to have singular strata. I will give a survey of several recent results regarding this singular uniformization problem, connecting microlocal techniques with complex analysis and synthetic geometry. Based on joint works with Rafe Mazzeo and Bin Xu.
- Supplements
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Notes
3.02 MB application/pdf
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12:00 PM - 02:00 PM
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Lunch
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- Location
- SLMath: Atrium
- Video
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- Abstract
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- Supplements
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02:00 PM - 03:00 PM
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Analysis on singular spaces
Jesse Gell-Redman (University of Melbourne)
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- Location
- SLMath: Eisenbud Auditorium
- Video
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- Abstract
I will report on recent and ongoing work on the analysis of Dirac-type operators on incomplete Riemannian manifold on which the metric undergoes structured degeneration. This includes joint work with Pierre Albin.
- Supplements
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Notes
6.72 MB application/pdf
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03:00 PM - 03:00 PM
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Tea
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- Location
- SLMath: Atrium
- Video
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- Abstract
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- Supplements
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03:30 PM - 04:30 PM
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Reflections on fractional Laplacians
Rafe Mazzeo (Stanford University)
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- Location
- SLMath: Eisenbud Auditorium
- Video
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- Abstract
I first discuss a new perspective on fractional Laplacians, leading to a sharp boundary regularity theory for this problem. This is a counterpoint to Grubb’s more analytic approach. Joint work with Gimperlein and Louca. I will then discuss the beginnings of a general theory being developed with Albin and Marzuola of Dirichlet-to-Neumann operators on domains with stratified boundary.
- Supplements
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Notes
3.73 MB application/pdf
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Oct 15, 2019
Tuesday
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09:30 AM - 10:30 AM
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Asymptotic location of resonances for Schrödinger operators on infinite cylinders
Tanya Christiansen (University of Missouri)
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- Location
- SLMath: Eisenbud Auditorium
- Video
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- Abstract
![](/ckeditor_assets/pictures/1382/content_Christiansen.JPG)
- Supplements
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Notes
3.87 MB application/pdf
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10:30 AM - 11:00 AM
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Break
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- Location
- SLMath: Atrium
- Video
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- Abstract
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- Supplements
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11:00 AM - 12:00 PM
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Quasimodes and completely integrable systems
Fabricio Macia (Universidad Politécnica de Madrid)
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- Location
- SLMath: Eisenbud Auditorium
- Video
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- Abstract
We review results on the concentration properties of quasimodes for Schrödinger operators whose underlying Hamiltonian flow is completely integrable. In particulrar, we will present joint work with Víctor Arnaiz (Madrid) and Gabriel Riviere (Nantes).
- Supplements
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Notes
2.63 MB application/pdf
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12:00 PM - 02:00 PM
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Lunch
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- Location
- SLMath: Atrium
- Video
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- Abstract
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- Supplements
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02:00 PM - 03:00 PM
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Local Index Theory in Lorentzian Geometry
Alexander Strohmaier (University of Leeds)
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- Location
- SLMath: Eisenbud Auditorium
- Video
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- Abstract
I will state the index theorem for twisted Dirac operators on globally hyperbolic spacetimes with compact Cauchy surfaces. These operators are hyperbolic but still Fredholm on appropriate function spaces. I will give a local proof of the index theorem based on a local construction of the Feynman parametrix. (joint work with C. Baer)
- Supplements
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Notes
2.9 MB application/pdf
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03:00 PM - 03:00 PM
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Tea
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- Location
- SLMath: Atrium
- Video
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- Abstract
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- Supplements
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03:30 PM - 04:30 PM
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Lp norms via geodesic beams
Jeffrey Galkowski (University College London)
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- Location
- SLMath: Eisenbud Auditorium
- Video
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- Abstract
In this talk, we discuss the geodesic beam approach to eigenfunction concentration and give applications to the study of the norms of eigenfunctions for p larger than the critical exponent. In particular, we will give quantitative improvements to these estimates which rely only on dynamical assumptions and describe the concentration behavior of saturating examples.
- Supplements
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Notes
32.9 MB application/pdf
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04:40 PM - 05:40 PM
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Viscosity Limits for 0th order operators
Maciej Zworski (University of California, Berkeley)
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- Location
- SLMath: Eisenbud Auditorium
- Video
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- Abstract
For self-adjoint pseudodifferential operators of order 0, Colin de Verdiere and Saint-Raymond introduced natural dynamical conditions (motivated by the study of internal waves in fluids) guaranteeing absolute continuity of the spectrum. I will present an alternative approach to obtaining such results based on Melrose's radial propagation estimates from scattering theory (joint work with S Dyatlov). I will then explain how an adaptation of the Helffer–Sjoestrand theory of scattering resonances shows that in a complex neighbourhood of the continuous spectrum viscosity eigenvalues have limits as viscosity goes to 0. Here the viscosity eigenvalues are the eigen- values of the original operator to which an anti-self-adjoint elliptic 2nd order operator is added (joint work with J Galkowski).
- Supplements
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Notes
44.3 MB application/pdf
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05:40 PM - 07:00 PM
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Reception
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- Location
- SLMath: Atrium
- Video
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- Abstract
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- Supplements
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Oct 16, 2019
Wednesday
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09:30 AM - 10:30 AM
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Exact controllability for the Schr ̈odinger-Grushin equation
Nicolas Burq (Université Paris-Saclay)
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10:30 AM - 11:00 AM
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Break
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- Location
- SLMath: Atrium
- Video
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- Abstract
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- Supplements
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11:00 AM - 12:00 PM
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Dispersive estimates for the semi-classical Schrödinger equation inside a strictly convex domain
Oana Ivanovici (Sorbonne University)
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- Location
- SLMath: Eisenbud Auditorium
- Video
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- Abstract
We consider the semiclassical Schrdinger equation inside a model strictly convex domain and we obtain dispersion estimates for the linear flow; we highlight a 1/4 loss compared to the flat case.
- Supplements
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Notes
1.92 MB application/pdf
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Oct 17, 2019
Thursday
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09:30 AM - 10:30 AM
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Inverse problems for real principal type operators
Mikko Salo (University of Jyväskylä)
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- Location
- SLMath: Eisenbud Auditorium
- Video
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- Abstract
We consider inverse boundary value problems for general real principal type differential operators. The first results state that the Cauchy data set uniquely determines the scattering relation of the operator and bicharacteristic ray transforms of lower order coefficients. We also give two different boundary determination methods for general operators, and prove global uniqueness results for determining coefficients in nonlinear real principal type equations. The article presents a unified approach for treating inverse boundary problems for transport and wave equations, and highlights the role of propagation of singularities in the solution of related inverse problems. This is joint work with Lauri Oksanen (UCL), Plamen Stefanov (Purdue) and Gunther Uhlmann (Washington / IAS HKUST).
- Supplements
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Notes
2.64 MB application/pdf
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10:30 AM - 11:00 AM
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Break
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- Location
- SLMath: Atrium
- Video
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- Abstract
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- Supplements
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11:00 AM - 12:00 PM
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Inverse boundary problems for semilinear elliptic PDE
Katya Krupchyk (University of California, Irvine)
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- Location
- SLMath: Eisenbud Auditorium
- Video
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- Abstract
In this talk we shall discuss recent progress for partial data inverse boundary problems for semilinear elliptic PDE. It turns out that the presence of a nonlinearity allows one to solve inverse problems in situations where the corresponding linear counterpart is open. In the first part of the talk, we shall also discuss some previous work on partial data inverse boundary problems for linear elliptic PDE, focusing on the case of coefficients of low regularity. This talk is based on joint work with Gunther Uhlmann.
- Supplements
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Notes
7.05 MB application/pdf
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12:00 PM - 02:00 PM
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Lunch
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- Location
- SLMath: Atrium
- Video
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- Abstract
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- Supplements
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02:00 PM - 03:00 PM
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Recent progress on the Fried conjecture
Nguyen Viet Dang (Institut Camille Jordan)
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- Location
- SLMath: Eisenbud Auditorium
- Video
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- Abstract
I will talk about joint work with Guillarmou, Rivière, Shen and ongoing work with Chaubet on the relation between Ruelle zeta functions of contact Anosov flows and various forms of torsions. The goal of these works is to understand the Fried conjecture for smooth Anosov flows beyond constant negative curvature.
- Supplements
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Notes
15.2 MB application/pdf
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03:00 PM - 03:00 PM
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Tea
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- Location
- SLMath: Atrium
- Video
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- Abstract
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- Supplements
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03:30 PM - 04:30 PM
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Systoles and Lagrangians of random complex projective hypersurfaces
Damien Gayet (Université Grenoble Alpes (Université de Grenoble I - Joseph Fourier))
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- Location
- SLMath: Eisenbud Auditorium
- Video
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- Abstract
The smooth degree d complex curves of are Riemann surfaces of the same genus . If we equip them with the restriction of the ambient metric and choose them at random, what can be say about the length of their systole? I will explain that the probability that the systole is of the order is bounded from below by a uniform positive constant. This gives an partial analogous result to Mirzakhani's theorem on random hyperbolic curves. If I have time, I will explain that in higher dimensions, these probabilistic arguments provide a new deterministic result about Lagrangian submanifolds and the topology of complex projective hypersurfaces.
- Supplements
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Notes
20.7 MB application/pdf
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Oct 18, 2019
Friday
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09:00 AM - 10:00 AM
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Microlocal analysis of contact Anosov flows
Frederic Faure (Université Grenoble Alpes (Université de Grenoble I - Joseph Fourier))
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- Location
- SLMath: Eisenbud Auditorium
- Video
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- Abstract
In the 80's, D. Ruelle, D. Bowen and others have introduced probabilistic and spectral methods in order to study deterministic chaos ("Ruelle resonances"). For example, a geodesic flow on a strictly negative curvature Riemannian manifold is chaotic: each trajectory is strongly unstable and its behavior is unpredictable. A smooth probability distribution evolves also in a complicated way since it acquires higher and higher oscillations. Nevertheless this evolution is predictable in the sense of distributions and converges towards equilibrium. Following this approach and use of microlocal analysis, one obtains that long time fluctuations of classical probabilities are described by an effective quantum wave equation. This may be surprising because there is no added quantization procedure. Joint work with Masato Tsujii.
- Supplements
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Notes
3.77 MB application/pdf
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10:00 AM - 10:30 AM
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Break
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- Location
- SLMath: Atrium
- Video
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- Abstract
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- Supplements
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10:30 AM - 11:30 AM
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Semi-classical analysis of Schr ̈odinger equation on H-type groups
Clotilde Fermanian Kammerer (Université Paris-Est Créteil Val-de-Marne)
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- Location
- SLMath: Eisenbud Auditorium
- Video
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- Abstract
We present in this talk recent results obtained in collaboration with V ́eronique Fischer (University of Bath, UK) aiming at studying the spectral properties of sub-Laplacian operators. We develop a semi-classical approach compatible with the Lie group structure and we discuss the associated notion of semi-classical measures, together with their dispersive properties when related with solutions of a Schr ̈odinger equation in H-type groups.
- Supplements
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Notes
4.07 MB application/pdf
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11:30 AM - 12:30 PM
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The inverse spectral problem for strictly convex domains
Hamid Hezari (University of California, Irvine)
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- Location
- SLMath: Eisenbud Auditorium
- Video
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- Abstract
In this talk I will discuss the recent developments in the inverse spectral theory of bounded planner domains with strictly convex smooth boundaries. I will first present a joint work with Steve Zelditch in which we prove ellipses of small eccentricity are spectrally unique among all smooth domains. I will then discuss an inverse spectral result for nearly circular domains with an axial symmetry. A linearized version of this problem was studied by De Simoi, Kaloshin, and Wei. The non-linear problem is more interesting and uses second variations of the length functions and also some techniques of Avila, De Simoi, and Kaloshin
- Supplements
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Notes
2.72 MB application/pdf
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12:30 PM - 02:00 PM
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Lunch
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- Location
- SLMath: Atrium
- Video
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- Abstract
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- Supplements
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