English

Entire curves generating all shapes of Nevanlinna currents

Complex Variables 2023-11-20 v1 Dynamical Systems

Abstract

First, we show that every complex torus T\mathbb{T} contains some entire curve g:CTg: \mathbb{C}\rightarrow \mathbb{T} such that the concentric holomorphic discs {gDr}r>0\{g\restriction_{\overline{\mathbb D}_{r}}\}_{r>0} can generate all the Nevanlinna/Ahlfors currents on T\mathbb T at cohomological level. This confirms an anticipation of Sibony. Developing further our new method, we can construct some twisted entire curve f:CCP1×Ef: \mathbb{C}\rightarrow \mathbb{CP}^1\times E in the product of the rational curve CP1\mathbb{CP}^1 and an elliptic curve EE, such that, concerning Siu's decomposition, demanding any cardinality JZ0{}|J|\in \mathbb{Z}_{\geqslant 0}\cup \{\infty\} and that Tdiff\mathcal{T}_{\mathrm{diff}} is trivial (J1|J|\geqslant 1) or not (J0|J|\geqslant 0), we can always find a sequence of concentric holomorphic discs {fDrj}j1\{f\restriction_{\overline{\mathbb D}_{r_j}}\}_{j \geqslant 1} to generate a Nevanlinna/Ahlfors current T=Talg+Tdiff\mathcal{T}=\mathcal{T}_{\mathrm{alg}}+\mathcal{T}_{\mathrm{diff}} with the singular part Talg=jJλj[Cj]\mathcal{T}_{\mathrm{alg}}=\sum_{j\in J} \,\lambda_j\cdot[\mathsf C_j] in the desired shape. This fulfills the missing case where J=0|J|=0 in the previous work of Huynh-Xie. By a result of Duval, each Cj\mathsf C_j must be rational or elliptic. We will show that there is no a priori restriction on the numbers of rational and elliptic components in the support of Talg\mathcal{T}_{\mathrm{alg}}, thus answering a question of Yau and Zhou. Moreover, we will show that the positive coefficients {λj}jJ\{\lambda_j\}_{j\in J} can be arbitrary as long as the total mass of Talg\mathcal{T}_{\mathrm{alg}} is less than or equal to 11. Our results foreshadow striking holomorphic flexibility of entire curves in Oka geometry, which deserves further exploration.

Keywords

Cite

@article{arxiv.2311.10667,
  title  = {Entire curves generating all shapes of Nevanlinna currents},
  author = {Hao Wu and Song-Yan Xie},
  journal= {arXiv preprint arXiv:2311.10667},
  year   = {2023}
}