Vanishing Abelian integrals for balanced and unbalanced cycles

Let F(x,y)=y2+f(x)F(x,y)=y^2+f(x) with fC[x]f\in\mathbb{C}[x], let κC[x]\kappa\in\mathbb{C}[x], and let g(x)g(x) be the function associated to κ\kappa as in the source. Let γ(t)\gamma(t) be a cycle of FF; its associated zero-cycle is ϕ(γ(t))\phi(\gamma(t)), and call it trivial, balanced, unbalanced, or totally unbalanced according to the corresponding zero-cycle. For polynomial decompositions, define

Hk(x,y)=(hk(x),y).H_k(x,y)=(h_k(x),y).

Vanishing-integral conjecture. (i) If γ(t)\gamma(t) is totally unbalanced, then

γ(t)κ(x)ydx0\int_{\gamma(t)}\kappa(x)y\,dx\equiv 0

if and only if there exist fk,hkC[x]f_k,h_k\in\mathbb{C}[x] and functions gkg_k analytic in a neighborhood of infinity such that

f=fkhk(k=1,,s),g=g1h1++gshs,f=f_k\circ h_k\quad (k=1,\ldots,s),\qquad g=g_1\circ h_1+\cdots+g_s\circ h_s,

and every cycle Hk(γ)H_k(\gamma) is trivial. (ii) If γ(t)\gamma(t) is unbalanced, then the vanishing condition stated in the source, namely

, holds if and only if there exist $f_k,h_k\in\mathbb{C}[x]$ and functions $g_k$ analytic in a neighborhood of infinity satisfying the same decomposition conditions, and for every $k$ the projected cycle $H_k(\gamma)$ is either trivial or balanced and

\int_{h_k(\phi(\gamma(t)))}g_k\equiv 0.

These conditions are proposed as an analogue of the cited monodromy theorem, characterizing vanishing Abelian integrals on zero-dimensional cycles through polynomial decompositions and trivial or balanced projected cycles. The parser supplies no resolution evidence; the claim is therefore recorded as open. The source uses undefined references to $g$,

, and the precise indexing of the decompositions, so those details should be checked against the paper.

Sources & referencesView supporting material

Primary source

Amelia Álvarez Sánchez, José Luis Bravo Trinidad and Pavao Mardesić, “Vanishing Abelian integrals on zero-dimensional cycles”, arXiv:1101.1777 (2011).

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