Smoothing of Limit Linear Series of Rank One on Saturated Metrized Complexes of Algebraic Curves

Luo, Ye ; Manjunath, Madhusudan

Canadian journal of mathematics, Tome 70 (2018) no. 3, pp. 628-682

Résumé

We investigate the smoothing problem of limit linear series of rank one on an enrichment of the notions of nodal curves and metrized complexes called saturated metrized complexes. We give a finitely verifiable full criterion for smoothability of a limit linear series of rank one on saturated metrized complexes, characterize the space of all such smoothings, and extend the criterion to metrized complexes. As applications, we prove that all limit linear series of rank one are smoothable on saturated metrized complexes corresponding to curves of compact-type, and we prove an analogue for saturated metrized complexes of a theorem of Harris and Mumford on the characterization of nodal curves contained in a given gonality stratum. In addition, we give a full combinatorial criterion for smoothable limit linear series of rank one on saturated metrized complexes corresponding to nodal curves whose dual graphs are made of separate loops.

Détail

DOI : 10.4153/CJM-2017-027-2

Mots-clés : 14T05, limit linear series, metrized complex

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