Mathematics – Number Theory
Scientific paper
2010-08-31
Mathematics
Number Theory
30 pages
Scientific paper
This paper studies the Fourier expansion of Hecke-Maass eigenforms for $GL(2, \mathbb Q)$ of arbitrary weight, level, and character at various cusps. Translating well known results in the theory of adelic automorphic representations into classical language, a multiplicative expression for the Fourier coefficients at any cusp is derived. In general, this expression involves Fourier coefficients at several different cusps. A sufficient condition for the existence of multiplicative relations among Fourier coefficients at a single cusp is given. It is shown that if the level is 4 times (or in some cases 8 times) an odd squarefree number then there are multiplicative relations at every cusp. We also show that a local representation of $GL(2, \mathbb Q_p)$ which is isomorphic to a local factor of a global cuspidal automorphic representation generated by the adelic lift of a newform of arbitrary weight, level $N$, and character $\chi\pmod{N}$ cannot be supercuspidal if $\chi$ is primitive. Furthermore, it is supercuspidal if and only if at every cusp (of width $m$ and cusp parameter = 0) the $mp^\ell$ Fourier coefficient, at that cusp, vanishes for all sufficiently large positive integers $\ell$. In the last part of this paper a three term identity involving the Fourier expansion at three different cusps is derived.
Goldfeld Dorian
Hundley Joseph
Lee Min
No associations
LandOfFree
Fourier expansions of GL(2) newforms at various cusps does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Fourier expansions of GL(2) newforms at various cusps, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fourier expansions of GL(2) newforms at various cusps will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-645332