Nef line bundles on Calabi-Yau threefolds, I
Nef line bundles on Calabi-Yau threefolds, I
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Calabi-Yau 上的 Nef 线路捆绑三倍,我
DOI:
10.1093/imrn/rnx191
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Th. Peternell
中科院分区:
文献类型:
--
作者:
V. Lazic;K. Oguiso;Th. Peternell
Let $F=x^2+y^2-z^2$, and let $x_0 \in \mathbb{Z}^3$ be a $primitive$ solution to $F(x_0)=0$, e.g., so that its coordinates share no nontrivial divisor. Let $\Gamma \leq \mathrm{SO_F(\mathbb{Z})}$ be a thin subgroup. We consider the resulting thin orbits of Pythagorean triples $x_0 \cdot \Gamma$—specifically which hypotenuses, areas, and products of all three coordinates arise. We produce infinitely many $R$-almost primes in these three cases whenever $\Gamma$ has exponent $\delta_\Gamma>\delta_0(R)$ for explicit $R$, $\delta_0$.