on the Zeroes of Hasse -weil L-function - MathOverflow

on the Zeroes of Hasse -weil L-function

2011-07-23T11:51:28Z

my question is that

already we know that the Birch and Swinnerton Dyer conjecture ,formally conjectures that the Hasse-weil L-function should have a zero at $s=1$ when curves have infinitely many rational points on it,

so my question is that imagine an elliptic curve $E/\mathbb{Q}$ which has rank $r>0$ and with $ \left|{E(\mathbb{Q})}\right|=\infty$ so we find that $L(E/\mathbb{Q},s)_{s=1}=0$

but i am interested in the zeroes on the line $s=1+it$, we know that above curve has got a zero at $s=1$ so are there any zeroes on the line $s=1+it$ ,if so tell me the cardinality of set of zeroes ,i mean whether there are finite zeroes or infinitely many zeroes

and if i get the answer there is a deep intuition behind the answer and properties of elliptic curves,

and may be someone can conjecture still more things knowing the zeroes there on the line

thank you, touch everyone's feet who helped me,by suggesting books,and resources and making me what i am today by studying privately

Answer by Micah Milinovich for on the Zeroes of Hasse -weil L-function

2011-07-23T12:13:36Z

The $L$-function has about $\displaystyle{\frac{T}{\pi} \log T \ }$ zeros in the strip with $0 < t < T$. See section 5.3 of Iwaniec and Kowalski's "Analytic Number Theory," in particular Theorem 5.8.

It should be possible, if it hasn't been done already, to show that a positive proportion of these zeros are on the critical line using Selberg's method. Hafner extended Selberg's method to various families of degree 2 $L$-functions in a series of papers in the 1980s.

Answer by Frank Thorne for on the Zeroes of Hasse -weil L-function

2011-07-23T20:54:42Z

+1 to Micah, read his answer first!

As an addendum, the $L$-function of an elliptic curve looks like (and is) an $L$-function of degree 2. It has a certain conductor, which is defined in terms of the primes of bad reduction and which affects the analytic behavior of the $L$-function.

But beyond that, there is unfortunately not a lot that is known from an analytic perspective for elliptic curve $L$-functions in particular. Once it is proved that they have analytic continuation and a functional equation, knowledge of where the $L$-function came from seems to be disappointingly useless for proving theorems. (With some exceptions, e.g., the value of the critical point; there is also the modularity theorem, etc. but I am not regarding that as "analytic".) There is a lot of general machinery, which is very well explained in Chapter 5 of Iwaniec and Kowalski for general $L$-functions in general. Beyond that, my impression (which could be mistaken) is that not a whole lot is known.