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DTSTART:20210314T060000
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DTSTART;TZID=America/Halifax:20220211T160000
DTEND;TZID=America/Halifax:20220211T170000
DTSTAMP:20220122T143038Z
CREATED:20200904T115630Z
LAST-MODIFIED:20220122T143038Z
UID:6556-1644595200-1644598800@aarms.math.ca
SUMMARY:Dalhousie-AARMS AAMP Seminar: Cyril Letrouit (École Normale Supérieure)
DESCRIPTION:Title – Propagation of singularities in subelliptic PDEs \nAbstract – In this talk\, we consider the wave equation where the Laplacian is replaced by a sub-Laplacian (also called “Hörmander sum of square”)\, which is an hypoelliptic operator. We handle the problem of describing the propagation of singularities in such equations : the main new phenomenon that we describe is that singularities can propagate along abnormal curves at any speed between 0 and 1. This general result extends an idea due to R. Melrose\, and we then illustrate it on anexample\, the Martinet case\, following a joint work with Y. Colin de Verdière.  Our statements are part of a classical/quantum correspondance between sub-Riemannian geometry (on the classical side) and the hypoelliptic operator (on the quantum side)\, which is also helpful to interpret results in control theory and spectral theory of hypoelliptic operators. \nThe Dalhousie-AARMS Analysis-Applied Math-Physics Seminar takes place on Fridays from 4 – 5 pm Atlantic Time over Zoom.  If you would like to attend\, please email the organizers for connection details.
URL:https://aarms.math.ca/event/dalhousie-aarms-aamp-seminar-steven-lester-kings-college-london-2-2-3-2-2-2-4/
LOCATION:Zoom seminar
CATEGORIES:AAMP Seminar
ORGANIZER;CN="Suresh Eswarathasan":MAILTO:sr766936@dal.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Halifax:20220218T160000
DTEND;TZID=America/Halifax:20220218T170000
DTSTAMP:20220211T135448Z
CREATED:20200904T115630Z
LAST-MODIFIED:20220211T135448Z
UID:6558-1645200000-1645203600@aarms.math.ca
SUMMARY:Dalhousie-AARMS AAMP Seminar: Micah Milinovich (U. Mississippi)
DESCRIPTION:Title: Fourier optimization\, prime gaps\, and zeta zeros\n\nAbstract: There are many situations where one imposes certain conditions on a function and its Fourier transform and then wants to optimize a certain quantity. I will describe two ways these types of Fourier optimization problems can arise in the context of the explicit formula\, which relates the primes to the zeros of the Riemann zeta-function. Using information from the zeros to study the primes\, I will show how one can prove the strongest known estimates in the classical problem of bounding the maximum gap between consecutive primes assuming the Riemann hypothesis. Using the explicit formula in the other direction\, one can also use Fourier optimization to prove the strongest known conditional estimates for the number of zeta zeros in an interval on the critical line. This is based on joint works with E. Carneiro\, V. Chandee\, and K. Soundararajan.\nThe Dalhousie-AARMS Analysis-Applied Math-Physics Seminar takes place on Fridays from 4 – 5 pm Atlantic Time over Zoom.  If you would like to attend\, please email the organizers for connection details.
URL:https://aarms.math.ca/event/dalhousie-aarms-aamp-seminar-steven-lester-kings-college-london-2-2-3-2-2-2-4-2/
LOCATION:Zoom seminar
CATEGORIES:AAMP Seminar
ORGANIZER;CN="Suresh Eswarathasan":MAILTO:sr766936@dal.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Halifax:20220311T160000
DTEND;TZID=America/Halifax:20220311T170000
DTSTAMP:20220308T140357Z
CREATED:20200904T115630Z
LAST-MODIFIED:20220308T140357Z
UID:6561-1647014400-1647018000@aarms.math.ca
SUMMARY:Dalhousie-AARMS AAMP Seminar: Justin Tzou (Macquarie U.)
DESCRIPTION:Title: Modeling and analysis of localized vegetation patterns on curved topography\n\nAbstract: We propose a two-component reaction-advection-diffusion model for vegetation density and soil water concentration on a curved terrain which accounts for downhill flow of soil water\, spatially dependent effective evaporation of soil water\, and vertical rainfall on a curved surface. In the limit of slow diffusion of vegetation\, we construct a one-spot localized solution corresponding to one patch of a periodic spotted vegetation pattern. We derive an ODE for the motion of the spot and determine how it is impacted by different aspects of the terrain. One such aspect is captured by the regular part of a certain Green’s function on the curved surface; I will briefly discuss how we numerically compute this quantity. Joint work with Leo Tzou.\nThe Dalhousie-AARMS Analysis-Applied Math-Physics Seminar takes place on Fridays from 4 – 5 pm Atlantic Time over Zoom.  If you would like to attend\, please email the organizers for connection details.
URL:https://aarms.math.ca/event/dalhousie-aarms-aamp-seminar-steven-lester-kings-college-london-2-2-3-2-2-2-4-2-2/
LOCATION:Zoom seminar
CATEGORIES:AAMP Seminar
ORGANIZER;CN="Suresh Eswarathasan":MAILTO:sr766936@dal.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Halifax:20220325T160000
DTEND;TZID=America/Halifax:20220325T170000
DTSTAMP:20220211T135543Z
CREATED:20200904T115630Z
LAST-MODIFIED:20220211T135543Z
UID:6586-1648224000-1648227600@aarms.math.ca
SUMMARY:Dalhousie-AARMS AAMP Seminar: Manuela Girotti (Saint Mary's Uni.)
DESCRIPTION:Title: Asymptotic Analysis of the Interaction Between a Soliton and a Regular Gas of Solitons (a.k.a. Gulliver and the Lilliputians) \nAbstract: N. Zabusky coined the word “soliton” in 1965 to describe a curious feature he and M. Kruskal observed in their numerical simulations of the initial-value problem for a simple nonlinear PDE. The first part of the talk will be a broad introduction to the theory of solitons/solitary waves and integrable PDEs (the KdV and modified KdV equation in particular)\, describing classical results in the field. \n\nThe second part will focus on some new developments and growing interest into a special case of solitons defined as “solitonic gas” or “integrable turbulence”. In particular\, we will discuss a recent work on long-time asymptotic behaviour of such type of solitons. We will achieve our results by first framing the problem in the setting of a Riemann–Hilbert problem and then by rigorously analyzing it using the powerful technique of nonlinear steepest descent.\n\nThis is a joint work with Tamara Grava (U. Bristol/SISSA)\, Bob Jenkins (UCF)\, Ken McLaughlin (CSU) and Alexander Minakov (U. Karlova).\nThe Dalhousie-AARMS Analysis-Applied Math-Physics Seminar takes place on Fridays from 4 – 5 pm Atlantic Time over Zoom.  If you would like to attend\, please email the organizers for connection details.
URL:https://aarms.math.ca/event/dalhousie-aarms-aamp-seminar-steven-lester-kings-college-london-2-2-3-2-2-2-4-2-2-2/
LOCATION:Zoom seminar
CATEGORIES:AAMP Seminar
ORGANIZER;CN="Suresh Eswarathasan":MAILTO:sr766936@dal.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Halifax:20230113T160000
DTEND;TZID=America/Halifax:20230113T170000
DTSTAMP:20230110T200300Z
CREATED:20200904T115630Z
LAST-MODIFIED:20230110T200300Z
UID:6991-1673625600-1673629200@aarms.math.ca
SUMMARY:Dalhousie-AARMS AAMP Seminar: Andrea Bertozzi (UCLA)
DESCRIPTION:Title:  Energy Minimizing Surface Tension Configurations for Microparticles\nAbstract: An important area of microfluidics is the creation and manipulation of small droplets. This is commonly done using microchannels or electrowetting. Recently a new method is proposed to create templated droplets using amphiphilic microparticles. These particles are observed to hold nearly equal volumes of aqueous liquid when dispersed in an oil–water mixture. However a theory for this behavior is lacking. In this paper\, we present a mathematical model based on minimizing the surface tension energy of a system of particles. By analyzing this model\, we demonstrate that certain key properties of the particle guarantee the formation of small droplets within a volume range unique to the particle. We also look at statistical dynamics of pairwise exchange of fluids between particles for which the system can reach equilibrium.  We show examples of how such particles are useful for applications such asbiological assays and measurement of chemical secretions from single cells.\n\nThe Dalhousie-AARMS Analysis-Applied Math-Physics Seminar takes place on Fridays from 4 – 5 pm Atlantic Time over Zoom and in Chase 227.  If you would like to attend\, please email the organizers for connection details.
URL:https://aarms.math.ca/event/dalhousie-aarms-aamp-seminar-steven-lester-kings-college-london-2-2-3-2-2-2-4-2-2-2-2/
LOCATION:Dalhousie University\, Halifax\, Nova Scotia\, Canada
CATEGORIES:AAMP Seminar
ORGANIZER;CN="Suresh Eswarathasan":MAILTO:sr766936@dal.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Halifax:20230120T160000
DTEND;TZID=America/Halifax:20230120T170000
DTSTAMP:20230110T172249Z
CREATED:20200904T115630Z
LAST-MODIFIED:20230110T172249Z
UID:6994-1674230400-1674234000@aarms.math.ca
SUMMARY:Dalhousie-AARMS AAMP Seminar: Chamsol Park (Johns Hopkins University)
DESCRIPTION:Title: Eigenfunction restriction estimates on curves with nonvanishing geodesic curvatures\n\nAbstract: Studying eigenfunctions of the Laplace-Beltrami operator on compact Riemannian manifolds (without boundary) is one of the interesting topics in Harmonic Analysis. One way to study them is to consider the L^p estimates of the eigenfunctions restricted to submanifolds. In this talk\, we briefly summarize previous results and would like to talk about the logarithmic improved analogue for the restriction to curves with nonvanishing geodesic curvatures\, in the presence of nonpositive sectional curvatures in the manifolds. If time permits\, we will discuss some applications and open problems for the Schrodinger counterparts.\n\n\nThe Dalhousie-AARMS Analysis-Applied Math-Physics Seminar takes place on Fridays from 4 – 5 pm Atlantic Time over Zoom and in Chase 227.  If you would like to attend\, please email the organizers for connection details.
URL:https://aarms.math.ca/event/dalhousie-aarms-aamp-seminar-steven-lester-kings-college-london-2-2-3-2-2-2-4-2-2-2-2-2/
LOCATION:Dalhousie University\, Halifax\, Nova Scotia\, Canada
CATEGORIES:AAMP Seminar
ORGANIZER;CN="Suresh Eswarathasan":MAILTO:sr766936@dal.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Halifax:20230127T160000
DTEND;TZID=America/Halifax:20230127T170000
DTSTAMP:20230110T173057Z
CREATED:20200904T115630Z
LAST-MODIFIED:20230110T173057Z
UID:7006-1674835200-1674838800@aarms.math.ca
SUMMARY:Dalhousie-AARMS AAMP Seminar: Alex Barnett (Flatiron Institute\, NYC)
DESCRIPTION:Title: Equispaced Fourier representations for efficient Gaussian process regression from a billion data pointsAbstract: Gaussian process regression is widely used in geostatistics\, time-series analysis\, and machine learning. It infers an unknown continuous function in a principled fashion from noisy measurements at $N$ scattered data points.  The prior on the function is Gaussian\, with covariance given by some user-chosen translationally invariantkernel.  Yet $N$ has been limited to about $10^6$\, even with modern low-rank methods.  Focusing on low spatial dimension (1–3)\, we present a GP regression method using kernel approximation by an equispaced quadrature grid in the Fourier domain.  This enables the iterative solution of a smaller Toeplitz linear system\, exploiting both the FFT and the nonuniform FFT to give ${\mathcal O}(N)$ cost. The result is often one to two orders of magnitude faster than state of the art methods\, and enables cheap massive-scale regressions. For example\, for a 2D Mat\’ern-3/2 kernel and $N = 10^9$ points\, the posterior mean function is found to 3-digit accuracy in two minutes on a desktop.Joint work with Philip Greengard (Columbia) and Manas Rachh (Flatiron Institute)\nThe Dalhousie-AARMS Analysis-Applied Math-Physics Seminar takes place on Fridays from 4 – 5 pm Atlantic Time over either Zoom and/or in Chase 227 depending on the speaker.  If you would like to attend\, please email the organizers for connection details.
URL:https://aarms.math.ca/event/dalhousie-aarms-aamp-seminar-steven-lester-kings-college-london-2-2-3-2-2-2-4-2-2-2-2-2-2-2-2-2/
LOCATION:Dalhousie University\, Halifax\, Nova Scotia\, Canada
CATEGORIES:AAMP Seminar
ORGANIZER;CN="Suresh Eswarathasan":MAILTO:sr766936@dal.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Halifax:20230210T160000
DTEND;TZID=America/Halifax:20230210T170000
DTSTAMP:20221209T171515Z
CREATED:20200904T115630Z
LAST-MODIFIED:20221209T171515Z
UID:6996-1676044800-1676048400@aarms.math.ca
SUMMARY:Dalhousie-AARMS AAMP Seminar: Victor Ivrii (U. Toronto)
DESCRIPTION:Title + Abstract: TBD\nThe Dalhousie-AARMS Analysis-Applied Math-Physics Seminar takes place on Fridays from 4 – 5 pm Atlantic Time over either Zoom and/or in Chase 227 depending on the speaker.  If you would like to attend\, please email the organizers for connection details.
URL:https://aarms.math.ca/event/dalhousie-aarms-aamp-seminar-steven-lester-kings-college-london-2-2-3-2-2-2-4-2-2-2-2-2-2/
LOCATION:Dalhousie University\, Halifax\, Nova Scotia\, Canada
CATEGORIES:AAMP Seminar
ORGANIZER;CN="Suresh Eswarathasan":MAILTO:sr766936@dal.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Halifax:20230310T160000
DTEND;TZID=America/Halifax:20230310T170000
DTSTAMP:20221209T171625Z
CREATED:20200904T115630Z
LAST-MODIFIED:20221209T171625Z
UID:6998-1678464000-1678467600@aarms.math.ca
SUMMARY:Dalhousie-AARMS AAMP Seminar: Katrina Morgan (Northwestern University)
DESCRIPTION:Title + Abstract: TBD\nThe Dalhousie-AARMS Analysis-Applied Math-Physics Seminar takes place on Fridays from 4 – 5 pm Atlantic Time over either Zoom and/or in Chase 227 depending on the speaker.  If you would like to attend\, please email the organizers for connection details.
URL:https://aarms.math.ca/event/dalhousie-aarms-aamp-seminar-steven-lester-kings-college-london-2-2-3-2-2-2-4-2-2-2-2-2-2-2/
LOCATION:Dalhousie University\, Halifax\, Nova Scotia\, Canada
CATEGORIES:AAMP Seminar
ORGANIZER;CN="Suresh Eswarathasan":MAILTO:sr766936@dal.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Halifax:20230317T160000
DTEND;TZID=America/Halifax:20230317T170000
DTSTAMP:20230314T085635Z
CREATED:20200904T115630Z
LAST-MODIFIED:20230314T085635Z
UID:7000-1679068800-1679072400@aarms.math.ca
SUMMARY:Dalhousie-AARMS AAMP Seminar: Milivoje Lukic (Rice U.)
DESCRIPTION:Title: Universality limits for orthogonal polynomialsAbstract: It is often expected that the local statistical behavior ofeigenvalues of some system depends only on its local properties; forinstance\, the local distribution of zeros of orthogonal polynomials shoulddepend only on the local properties of the measure of orthogonality. Thisphenomenon is studied using an object called the Christoffel-Darbouxkernel. The most commonly studied case is known as bulk universality\,where the rescaled limit of Christoffel-Darboux kernels converges to thesine kernel.In this talk\, we will survey this subject\, prior results\, and a recentresult which gives for the first time a completely local sufficientcondition for bulk universality. The new approach is based on a matrixversion of the Christoffel-Darboux kernel and the de Branges theory ofcanonical systems\, and it applies to other self-adjoint systems with 2×2transfer matrices such as continuum Schrodinger and Dirac operators.The talk is based on joint work with Benjamin Eichinger (TechnicalUniversity Wien) and Brian Simanek (Baylor University).\nThe Dalhousie-AARMS Analysis-Applied Math-Physics Seminar takes place on Fridays from 4 – 5 pm Atlantic Time over either Zoom and/or in Chase 227 depending on the speaker.  If you would like to attend\, please email the organizers for connection details.
URL:https://aarms.math.ca/event/dalhousie-aarms-aamp-seminar-steven-lester-kings-college-london-2-2-3-2-2-2-4-2-2-2-2-2-2-2-2/
LOCATION:Dalhousie University\, Halifax\, Nova Scotia\, Canada
CATEGORIES:AAMP Seminar
ORGANIZER;CN="Suresh Eswarathasan":MAILTO:sr766936@dal.ca
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Halifax:20230331T160000
DTEND;TZID=America/Halifax:20230331T170000
DTSTAMP:20230224T143704Z
CREATED:20200904T115630Z
LAST-MODIFIED:20230224T143704Z
UID:7130-1680278400-1680282000@aarms.math.ca
SUMMARY:Dalhousie-AARMS AAMP Seminar: Erick Schulz (ETH Zürich)
DESCRIPTION:Title + Abstract: TBD\nThe Dalhousie-AARMS Analysis-Applied Math-Physics Seminar takes place on Fridays from 4 – 5 pm Atlantic Time over either Zoom and/or in Chase 227 depending on the speaker.  If you would like to attend\, please email the organizers for connection details.
URL:https://aarms.math.ca/event/dalhousie-aarms-aamp-seminar-steven-lester-kings-college-london-2-2-3-2-2-2-4-2-2-2-2-2-2-2-2-3/
LOCATION:Dalhousie University\, Halifax\, Nova Scotia\, Canada
CATEGORIES:AAMP Seminar
ORGANIZER;CN="Suresh Eswarathasan":MAILTO:sr766936@dal.ca
END:VEVENT
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