Pseudodifferential analysis, introduced in this book in a way
adapted to the needs of number theorists, relates automorphic
function theory in the hyperbolic half-plane to automorphic
distribution theory in the plane. Spectral-theoretic questions are
discussed in one or the other environment: in the latter one, the
problem of decomposing automorphic functions in according to the
spectral decomposition of the modular Laplacian gives way to the
simpler one of decomposing automorphic distributions in R2 into
homogeneous components. The Poincare summation process, which
consists in building automorphic distributions as series of
"g"-transforms, for "g E SL"(2";"Z), of some initial function, say
in "S"(R2), is analyzed in detail. On, a large class of new
automorphic functions or measures is built in the same way: one of
its features lies in an interpretation, as a spectral density, of
the restriction of the zeta function to any line within the
critical strip.
The book is addressed to a wide audience of advanced graduate
students and researchers working in analytic number theory or
pseudo-differential analysis."
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