Abstract
We prove that the moduli space \({\mathcal{M}_g}\) of smooth curves of genus g is the union of g−1 affine open subsets for every g with 2 ≤ g ≤ 5, as predicted by an intriguing conjecture of Eduard Looijenga.
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Accola R.D.: Some loci of Teichmüller space for genus five defined by vanishing theta nulls. Contributions to analysis (a collection of papers dedicated to Lipman Bers), pp. 11–18. Academic Press, New York (1974)
Arbarello E., Cornalba M.: Calculating cohomology groups of moduli spaces of curves via algebraic geometry. Inst. Hautes Études Sci. Publ. Math. 88, 97–127 (1998)
Arbarello, E., Cornalba, M.: Divisors in the moduli space of curves. Pre-print arXiv:0810.5373, to appear in Surveys in Differ. Geom.
Cornalba, M., Harris, J.: Divisor classes associated to families of stable varieties, with applications to the moduli space of curves. Ann. Sc. Ec. Norm. Sup., 4 s., t. 21:455–475 (1988)
Debarre O.: Le lieu des variétés abéliennes dont le diviseur thêta est singulier a deux composantes. Ann. Sc. Ec. Norm. Sup. 25, 687–708 (1992)
Faber, C., Looijenga, E.: Remarks on moduli of curves. Moduli of curves and abelian varieties. Aspects Math., E33, Vieweg , pp. 23–45 (1999)
Fontanari C., Looijenga E.: A perfect stratification of \({\mathcal{M}_g}\) for g ≤ 5. Geom. Dedicata 136, 133–143 (2008)
Grushevsky, S., Salvati Manni, R.: The superstring cosmological constant and the Schottky form in genus 5. arXiv:0809.1391 (2008)
Hain, R., Looijenga, E.: Mapping class groups and moduli spaces of curves. In: Proceedings of Symposia in Pure Mathematics, AMS, vol. 62, pp. 97–142 (1998)
Harer J.: The virtual cohomological dimension of the mapping class group of an orientable surface. Inv. Math. 84, 157–176 (1986)
Igusa J.: On the graded ring of theta constants. Am. J. Math. 89, 817–855 (1967)
Igusa J.: On the irreducibility of Schottky’s divisor. J. Fac. Sci. Tokyo 28, 531–545 (1981)
Mumford, D.: Tata Lectures on Theta II. Progress in Mathematics, vol. 43. Birkhäuser, Boston/Basel/Stuttgart (1984)
Salvati Manni R.: Slope of cusp forms and theta series. J. Number Theory 83, 282–296 (2000)
Tsuyumine S.: Thetanullwerte on a moduli space of curves and hyperelliptic loci. Math. Z. 207, 539–568 (1991)
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Fontanari, C., Pascolutti, S. An affine open covering of \({\mathcal{M}_g}\) for g ≤ 5. Geom Dedicata 158, 61–68 (2012). https://doi.org/10.1007/s10711-011-9620-1
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DOI: https://doi.org/10.1007/s10711-011-9620-1