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Quadratic twists of elliptic curves and class numbers
Journal of Number Theory ( IF 0.7 ) Pub Date : 2021-04-19 , DOI: 10.1016/j.jnt.2021.03.002
Michael Griffin , Ken Ono , Wei-Lun Tsai

For positive rank r elliptic curves E(Q), we employ ideal class pairingsE(Q)×ED(Q)CL(D), for quadratic twists ED(Q) with a suitable “small y-height” rational point, to obtain explicit class number lower bounds that improve on earlier work by the authors. For the curves E(a):y2=x3a, with rank r(a), this givesh(D)110|Etor(Q)|RQ(E)πr(a)22r(a)Γ(r(a)2+1)log(D)r(a)2loglogD, representing a general improvement to the classical lower bound of Goldfeld, Gross and Zagier when r(a)3. We prove that the number of twists ED(a)(Q) with such a suitable point (resp. with such a point and rank ≥2 under the Parity Conjecture) is a,εX12ε. We give infinitely many cases where r(a)6. These results can be viewed as an analogue of the classical estimate of Gouvêa and Mazur for the number of rank ≥2 quadratic twists, where in addition we obtain “log-power” improvements to the Goldfeld-Gross-Zagier class number lower bound.



中文翻译:

椭圆曲线和类数的二次扭曲

对于正秩r椭圆曲线E,我们采用理想的班级配对E×E-dCL-d 用于二次扭曲 E-d具有合适的“小y高度”有理点,以获得显式的类数下界,该下界在作者的早期工作中得到了改进。对于曲线E一种ÿ2个=X3-一种,排名 [R一种,这给H-d1个10|Er|[REπ[R一种2个2个[R一种Γ[R一种2个+1个日志d[R一种2个日志日志d 表示对Goldfeld,Gross和Zagier的经典下限进行了总体改进 [R一种3。我们证明了转数E-d一种 具有这样一个合适的点(在奇偶性猜想下具有这样的点和秩≥2的残差)是 一种εX1个2个-ε。我们给出了无数种情况,其中[R一种6。这些结果可以看作是古维阿和马祖尔对等级≥2的二次扭曲次数的经典估计的类似物,此外,我们还获得了戈德费尔德-格罗斯-扎吉尔类别数下限的“对数乘方”改进。

更新日期:2021-05-06
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