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• W1664921656 abstract "Let (G,) be a symmetric random walk on a compact Lie groupG. We will call (G, )a Lagrangean random walk if the step distribution , a probability measure on G, is also a Lagrangean distribution on G with respect to some Lagrangean submanifold TG. In particular, we are interested in the cases where is a smooth -function C along a 'positively curved hypersurface' C of G or where is a sum of-functions P j Cj along a finite union of regular conjugacy classes Cj inG. The Markov (transition) operator T of the Lagrangean random walk is then a Fourier integral operator and our purpose is to apply microlocal techniques to study the convolution powers k of: In cases where all convolution powers are 'clean' (such as for -functions on positively curved hypersurfaces), classical FIO methods will be used to determine the Sobolev smoothing order ofT onW s (G), the minimal powerk = k for which k 2 L 2 , the asympotics of the Fourier transformb( )o f along raysL =N of representations. In general, convolutions of Lagrangean measures are not 'clean' and there can occur a large variety of possible singular be- haviour in the convolution powers k . Classical FIO methods are then no longer sufficient to analyze the asymptotic properties of Lagrangean random walks. However, it is sometimes possible to restore the simple 'clean convolution' behaviour by restrict- ing the random walk to a fixed 'ray of representations'. In such cases, classical Toeplitz methods can be used to determine restricted versions of the above features along the ray. We will illustrate with the case of sums of -functions along unions of regular conjugacy classes." @default.
• W1664921656 created "2016-06-24" @default.
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• W1664921656 date "1998-01-01" @default.
• W1664921656 modified "2023-09-23" @default.
• W1664921656 title "Semi‐classical limit of random walks II" @default.
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