<p>The order of a constant cycle curve <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(C \subset X\)</EquationSource> </InlineEquation> on a complex K3 surface, defined by Huybrechts, is a positive integer that measures the obstruction to decomposing the diagonal class <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\Delta _C\)</EquationSource> </InlineEquation> in the Chow group <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\mathrm{CH}^2(X \times C)\)</EquationSource> </InlineEquation>. In this paper, we compute the order of elliptic constant cycle curves that naturally arise on Kummer surfaces, by passing to the transcendental intermediate Jacobian <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(J_{\textrm{tr}}^3(X \times C)\)</EquationSource> </InlineEquation>. As a consequence, every <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(n \in \mathbb {N}\)</EquationSource> </InlineEquation> can be realized as the order of a constant cycle curve on a complex K3 surface.</p>

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Elliptic constant cycle curves on Kummer surfaces

  • Jiexiang Huang

摘要

The order of a constant cycle curve \(C \subset X\) on a complex K3 surface, defined by Huybrechts, is a positive integer that measures the obstruction to decomposing the diagonal class \(\Delta _C\) in the Chow group \(\mathrm{CH}^2(X \times C)\) . In this paper, we compute the order of elliptic constant cycle curves that naturally arise on Kummer surfaces, by passing to the transcendental intermediate Jacobian \(J_{\textrm{tr}}^3(X \times C)\) . As a consequence, every \(n \in \mathbb {N}\) can be realized as the order of a constant cycle curve on a complex K3 surface.