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A NOTE ON RANK TWO STABLE BUNDLES OVER SURFACES

Published online by Cambridge University Press:  28 June 2021

GRACIELA REYES-AHUMADA
Affiliation:
CONACYT – U. A. Matemáticas, U. Autónoma de Zacatecas, Calzada Solidaridad entronque Paseo a la Bufa, C.P. 98000, Zacatecas, Zac. Mexico e-mail: [email protected]
L. ROA-LEGUIZAMÓN
Affiliation:
Instituto de Física y Matemáticas, Universidad Michoacana de San Nicolás de Hidalgo, Edificio C3, Ciudad Universitaria, C.P. 58040 Morelia, Mich. Mexico e-mail: [email protected]
H. TORRES-LÓPEZ
Affiliation:
CONACYT - U. A. Matemáticas, U. Autónoma de Zacatecas, Calzada Solidaridad entronque Paseo a la Bufa, C.P. 98000, Zacatecas, Zac. Mexico e-mail: [email protected]

Abstract.

Let π : XC be a fibration with integral fibers over a curve C and consider a polarization H on the surface X. Let E be a stable vector bundle of rank 2 on C. We prove that the pullback π*(E) is a H-stable bundle over X. This result allows us to relate the corresponding moduli spaces of stable bundles $${{\mathcal M}_C}(2,d)$$ and $${{\mathcal M}_{X,H}}(2,df,0)$$ through an injective morphism. We study the induced morphism at the level of Brill–Noether loci to construct examples of Brill–Noether loci on fibered surfaces. Results concerning the emptiness of Brill–Noether loci follow as a consequence of a generalization of Clifford’s Theorem for rank two bundles on surfaces.

Type
Research Article
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of Glasgow Mathematical Journal Trust

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Footnotes

The second author acknowledges the financial support of Programa para el Desarrollo Profesional Docente, para el Tipo Superior (PRODEP), clave UMSNH-CA-165.

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