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A Twisted AdjointL-Value of an Elliptic Modular Form

✍ Scribed by Keiji Goto


Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
360 KB
Volume
73
Category
Article
ISSN
0022-314X

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✦ Synopsis


We shall show an explicit value of a twisted adjoint L-value L(1, Ad( f ) /) attached to f. Here f is a primitive elliptic cusp form of ``Haupt''-type and / a quadratic character. The calculation can be done by using the formula of L(1, Ad( f ) /) obtained by Hida. This value supports numerically a conjecture of Doi Hida Ishii [3].


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It is a classical result (apparently due to Tate) that all elliptic curves with a torsion point of order n ð44n410; or n ¼ 12Þ lie in a one-parameter family. However, this fact does not appear to have been used ever for computing the torsion of an elliptic curve. We present here an extremely down-to