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Proceedings of the American Mathematical Society
Proceedings of the American Mathematical Society
ISSN 1088-6826(online) ISSN 0002-9939(print)


Critical points of the area functional of a complex closed curve on the manifold of Kähler metrics

Author: Abel Castorena
Journal: Proc. Amer. Math. Soc. 130 (2002), 1377-1381
MSC (2000): Primary 32Q15
Published electronically: December 20, 2001
MathSciNet review: 1879960
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Abstract: We consider a compact complex manifold $M$ of dimension $n$ that admits Kähler metrics and we assume that $C\hookrightarrow M$ is a closed complex curve. We denote by $\mathcal{KC}(1)$ the space of classes of Kähler forms $[\omega ]\in H^{1,1}(M,\mathbb{R} )$ that define Kähler metrics of volume 1 on $M$ and define $\mathbf{A}_{C}:\mathcal{KC}(1)\to \mathbb{R} $ by $\mathbf{A}_{C}([\omega ])=\int_{C} \omega =\text{area of }C\text{ in the induced metric by }\omega $. We show how the Riemann-Hodge bilinear relations imply that any critical point of $\mathbf{A}_{C}$ is the strict global minimum and we give conditions under which there is such a critical point $[\omega ]$: A positive multiple of $[\omega ]^{n-1}\in H^{2n-2}(M,\mathbb{R} )$is the Poincaré dual of the homology class of $C$. Applying this to the Abel-Jacobi map of a curve into its Jacobian, $C\hookrightarrow J(C)$, we obtain that the Theta metric minimizes the area of $C$ within all Kähler metrics of volume 1 on $J(C)$.

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Additional Information

Abel Castorena
Affiliation: CIMAT, AP. 402, CP. 36000 Guanajuato, Gto. Mexico

PII: S 0002-9939(01)06389-4
Keywords: K\"{a}hler form, K\"{a}hler manifold, Riemann-Hodge bilinear relations, Jacobian of a curve
Received by editor(s): November 2, 2000
Published electronically: December 20, 2001
Communicated by: Mohan Ramachandran
Article copyright: © Copyright 2001 American Mathematical Society

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