Abstract
Automorphic forms of arbitrary real weight can be considered as functions on the universal covering group of SL(2, ℝ). In this situation, we prove an invariant form of the Selberg trace formula for Hecke operators. For this purpose, the Fourier transforms of weightet orbital integrals, obtained by J. Arthur, R. Herb and P. Sally, jr., are explicitly calculated. Our formula does not follow from Arthur's invariant trace formula, since the group has infinite centre, and vector-valued automorphic forms with respect to non-congruence lattices are considered.
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Hoffmann, W. An invariant trace formula for the universal covering group of SL(2,ℝ). Ann Glob Anal Geom 12, 19–63 (1994). https://doi.org/10.1007/BF02108286
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DOI: https://doi.org/10.1007/BF02108286