668 research outputs found
On the gaps between non-zero Fourier coefficients of cusp forms of higher weight
We show that if a modular cuspidal eigenform of weight is
-adically close to an elliptic curve , which has a cyclic
rational -isogeny, then -th Fourier coefficient of is non-zero in the
short interval for all and for some . We use this fact to produce non-CM cuspidal eigenforms of level
and weight such that for all .Comment: To appear in The Ramanujan Journa
On sign changes of q-exponents of generalized modular functions
Let f be a generalized modular function of weight 0 of level N such that its
q-exponents c(n)(n>0) are all real, and div(f) is zero. In this note, we show
the equidistribution of signs for c(p)(p prime) by using equidistribution
theorems for normalized cuspidal eigenforms of integral weight.Comment: to appear in the Journal of Number Theor
On non-vanishing and sign changes of the Fourier coefficients of Hilbert cusp forms
In this article, we study (simultaneous) non-vanishing, (simultaneous) sign
changes of Fourier coefficients of (two) Hilbert cusp forms, respectively
Equidistribution of signs for Hilbert modular forms of half-integral weight
We prove an equidistribution of signs for the Fourier coefficients of Hilbert
modular forms of half-integral weight. Our study focuses on certain subfamilies
of coefficients that are accessible via the Shimura correspondence. This is a
generalization of the result of Inam and Wiese to the setting of totally real
number fieldsComment: To appear in Research in Number Theor
Some topics on the Fourier coefficients of modular forms
This thesis consists of three parts. In the first part, we study the gaps between
non-zero Fourier coefficients of cuspdial CM eigenforms in the short intervals. In
the second part, we study the sign changes for the Fourier coefficients of Hilbert
modular forms of half-integral weight. In the third part, we study the simultaneous
behaviour of Fourier coefficients of two different Hilbert modular cusp forms
of integral weight.
In Chapter 1, we present the definitions and some preliminaries on classical
modular forms. We shall also recall some relevant results from the literature, which
are useful in the subsequent chapters.
In Chapter 2, we show that for an elliptic curve E over Q of conductor N with
complex multiplication (CM) by Q(i), the n-th Fourier coefficient of fE is non-zero
in the short interval (X;X + cX
1
4 ) for all X � 0 and for some c > 0, where fE is
the corresponding cuspidal Hecke eigenform in S2
Simultaneous behaviour of the Fourier coefficients of two Hilbert modular cusp forms
In this article, we study the simultaneous sign changes of the Fourier
coefficients of two Hilbert cusp forms of different integral weights. We also
study the simultaneous non-vanishing of Fourier coefficients, of two distinct
non-zero primitive Hilbert cuspidal non-CM eigenforms of integral weights, at
powers of a fixed prime ideal.Comment: Submitted for publicatio
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