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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
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DTSTART;TZID=America/Halifax:20220218T160000
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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
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