Search arXiv⌕ Search

arXiv · 1711.02996

Entire holomorphic curves into projective plane intersecting few generic algebraic curves

Abstract

For $q\leq 3$ smooth plane algebraic curves $\mathcal{C}_i$ having simple normal crossings, if the invariant logarithmic $2$-jet differential bundle associated to $(\mathbb{P}^2(\mathbb{C}), \sum_{i=1}^q \mathcal{C}_i)$ has a nonzero section vanishing on some ample divisor, then, for every algebraically nondegenerate entire holomorphic curve $f\colon\mathbb{C}\rightarrow\mathbb{P}^2(\mathbb{C})$, we have a Second Main Theorem type estimate: \[ T_f(r) \leq c\sum_{i=1}^q\,N_f^{[1]}(r,\mathcal{C}_i) + o\big(T_f(r) \big)\parallel, \] where $T_f(r)$ and $N_f^{[1]}(r,C_i)$ stand for the order function and the $1$--truncated counting functions in the Nevanlinna theory, and where the constant $c=c(q,d_i)>0$ can be computed explicitly. In particular, our result includes the case of $3$ conics in $\mathbb{P}^2(\mathbb{C})$. Moreover, we provide some new results concerning the algebraic degeneracy of certain complex surfaces, e.g., the complex hyperbolicity of a very generic surface of degree $\geq 15$ in $\mathbb{P}^3(\mathbb{C})$.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Dinh Tuan Huynh, Duc-Viet Vu, Song-Yan Xie. 2018-04-10. Entire holomorphic curves into projective plane intersecting few generic algebraic curves. https://arxiv.org/abs/1711.02996

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

On the prime ideals of higher secant varieties of Veronese embeddings of small degrees

In this paper, we study minimal generators of the (saturated) defining ideal of the $k$-secant variety $σ_k(v_d(\mathbb{P}^n))$ of the image of the $d$-uple Veronese embedding $v_d: \mathbb{P}^n \rightarrow \mathbb{P}^N$ with ${N=\binom{n+d}{d}-1}$, focusing on cases where the degree of $σ_k(v_d(\mathbb{P}^n))$ is relatively small. First, we show that the prime ideal $I(σ_4(v_3(\mathbb{P}^3)))$ is minimally generated by $36$ homogeneous polynomials of degree $5$. This implies that $σ_4(v_3(\mathbb{P}^3)) \subset \mathbb{P}^{19}$ is a del Pezzo $4$-secant variety (i.e., $\mathrm{deg}(σ_4(v_3(\mathbb{P}^3))) = 105$ and the sectional genus $π(σ_4(v_3(\mathbb{P}^3))) = 316$), thereby providing a new example of an arithmetically Gorenstein variety of codimension $4$. This result addresses the symmetric version of the ``Salmon problem'' posed by E. Allman in \cite{Allman}. As an application, we decide the non-singularity of a certain locus in $σ_4(v_3(\mathbb{P}^3))$. Furthermore, by inheritance, we obtain the generators of $I(σ_4(v_3(\mathbb{P}^n)))$ for all $n \geq 3$. Based on the method used for $σ_4(v_3(\mathbb{P}^3))$, we also propose a procedure to compute the first non-trivial degree piece, $I(σ_k(v_d(\mathbb{P}^n)))_{k+1}$, for the general $k$-secant case using prolongation and weight space decomposition. Applying this procedure, we present a few more cases of $k$-secant varieties of relatively small degrees; in each of these cases, the ideal is generated in degree $k+1$ and can be fully determined by explicitly computing all generators within this degree piece.

math.AG↗

Equivariant automorphism group and real forms of complexity-one varieties

Let $G$ be a connected reductive real algebraic group. We prove that every real $G$-variety of complexity one admits only finitely many pairwise non-isomorphic $(\mathbb{R},G)$-forms. Our approach relies on representability and structural results for equivariant automorphism groups. More generally, over a perfect field, the equivariant automorphism group of an almost homogeneous variety under a smooth group scheme of finite type is represented by a smooth group scheme of finite type, and is linear whenever the acting group is linear. In characteristic zero, the equivariant automorphism group of every complexity-one variety under a connected reductive group is represented by a smooth group scheme locally of finite type. In the case that is not almost homogeneous, we further describe the subgroup acting trivially on the rational quotient as an extension of an étale group scheme, locally isomorphic to $\mathbb{Z}^m$, by a group of multiplicative type.

math.AG↗