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Automorphic products of singular weight. (Automorphe Produkte singulären Gewichts.) (German) Zbl 1211.11048
Mathematik. München: Dr. Hut; Darmstadt: TU Darmstadt, Fachbereich Mathematik (Diss.) (ISBN 978-3-86853-687-4/pbk). 136 p. (2010).
In this doctoral thesis the author constructs holomorphic modular forms of singular weight for the orthogonal group of an even lattice. For lattices of odd prime level she presents explicit formulas for the dimension of the spaces of vector valued modular forms (cusp forms) and for the Fourier coefficients of special vector valued Eisenstein series. She constructs lattices with trivial control space and determines the first Fourier coefficients of their Eisenstein series. On this way she finds a certain lattice, for which there exist Borcherds products of singular weight. She constructs one of these Borcherds products as a difference of two theta series.

##### MSC:
 11F11 Holomorphic modular forms of integral weight 11F41 Automorphic forms on $$\mbox{GL}(2)$$; Hilbert and Hilbert-Siegel modular groups and their modular and automorphic forms; Hilbert modular surfaces 11F55 Other groups and their modular and automorphic forms (several variables) 11F27 Theta series; Weil representation; theta correspondences 11F30 Fourier coefficients of automorphic forms