Wednesday, 26 October 2011

nt.number theory - Modular forms with prime Fourier coefficients zero

Write f=sumcifi as a sum over new eigenforms. Your condition is thus equivalent to sumcilambdai(p)=0 for all p. Taking the absolute value squared of this and summing over pleqX gives



0=sumi,jcioverlinecjsumpleqXlambdai(p)overlinelambdaj(p).



By the pnt for Rankin-Selberg L-functions, the inner sum over primes is simX(logX)1 if i=j, and is o(X(logX)1) otherwise. Taking X very large we obtain 0=cX(logX)1+o(X(logX)1), so contradiction.

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