Vol. 10, No. 9, 2016

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ISSN: 1944-7833 (e-only)
ISSN: 1937-0652 (print)
$\overline{\mathscr{R}}_{15}$ is of general type

Gregor Bruns

Vol. 10 (2016), No. 9, 1949–1964
DOI: 10.2140/ant.2016.10.1949

We prove that the moduli space ¯15 of Prym curves of genus 15 is of general type. To this end we exhibit a virtual divisor D¯15 on ¯15 as the degeneracy locus of a globalized multiplication map of sections of line bundles. We then proceed to show that this locus is indeed of codimension one and calculate its class. Using this class, we can conclude that K ¯ 15 is big. This complements a 2010 result of Farkas and Ludwig: now the spaces ¯g are known to be of general type for g 14.

Prym variety, Kodaira dimension, genus 15 curve, moduli space
Mathematical Subject Classification 2010
Primary: 14H10
Secondary: 14E08, 14H40, 14K10
Received: 18 December 2015
Revised: 19 April 2016
Accepted: 30 August 2016
Published: 22 November 2016
Gregor Bruns
Humboldt-Universität zu Berlin
Unter den Linden 6
D-10099 Berlin