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 , we employ ideal class pairings for quadratic twists 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 , with rank , this gives representing a general improvement to the classical lower bound of Goldfeld, Gross and Zagier when . We prove that the number of twists with such a suitable point (resp. with such a point and rank ≥2 under the Parity Conjecture) is . We give infinitely many cases where . 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,我们采用理想的班级配对 用于二次扭曲 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,排名 ,这给 表示对Goldfeld,Gross和Zagier的经典下限进行了总体改进 。我们证明了转数 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 。我们给出了无数种情况,其中。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。