Title: Profinite descent for Picard spaces and groups in K(n)-local chromatic homotopy theory Abstract: The study of Picard groups in homotopy theory was initiated by Hopkins-Mahowald-Sadofsky. They gave a general framework to compute Picard groups of the category of $K(n)$-local spectra. In the past decade, significant progress has been made in our understandings of Picard groups […]
Title: The asymptotic behavior of eigenfunctions on symmetric spacesAbstract: Let X be a compact locally symmetric space, and Y a locally symmetric subspace. Let f be an eigenfunction of the invariant differential operators on X with eigenvalue tending to infinity. I will present bounds for the period and Fourier coefficients of f along Y, and […]
Title: On stable transfer operators and functorial transfer kernels Abstract: Langlands introduced stable transfer operators as a fundamental part of his proposal of Beyond Endoscopy. They are intended to be used in comparisons of his proposed refinements of stable trace formulas, in an analogous role to that of endoscopic transfer operators in the theory of […]
Title: Number-theoretic methods to produce counterexamples for questions motivated by PDE’s.Abstract: In 1980 Carleson posed a question in PDE’s: how “well-behaved” must an initial data function be, to guarantee pointwise convergence of the solution of the linear Schrödinger equation (as time goes to zero)? After being studied by many authors over nearly 40 years, this celebrated […]
Title: Number-theoretic methods to produce counterexamples for questions motivated by PDE’s.Abstract: In 1980 Carleson posed a question in PDE’s: how “well-behaved” must an initial data function be, to guarantee pointwise convergence of the solution of the linear Schrödinger equation (as time goes to zero)? After being studied by many authors over nearly 40 years, this celebrated […]