The Hodge bundle, the universal 0-section, and the log Chow ring of the moduli space of curves
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Date
2023-02
Publication Type
Journal Article
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yes
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Abstract
We bound from below the complexity of the top Chern class of the Hodge bundle in the Chow ring of the moduli space of curves: no formulas for in terms of classes of degrees 1 and 2 can exist. As a consequence of the Torelli map, the 0-section over the second Voronoi compactification of the moduli of principally polarized abelian varieties also cannot be expressed in terms of classes of degree 1 and 2. Along the way, we establish new cases of Pixton's conjecture for tautological relations. In the log Chow ring of the moduli space of curves, however, we prove lies in the subalgebra generated by logarithmic boundary divisors. The proof is effective and uses Pixton's double ramification cycle formula together with a foundational study of the tautological ring defined by a normal crossings divisor. The results open the door to the search for simpler formulas for on the moduli of curves after log blow-ups.
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published
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Volume
159 (2)
Pages / Article No.
306 - 354
Publisher
Cambridge University Press
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Software
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Subject
moduli space of curves; Hodge bundle; tautological rings; logarithmic intersection theory; computer algebra
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It was possible to publish this article open access thanks to a Swiss National Licence with the publisher.
Funding
786580 - Moduli, algebraic cycles, and integration (EC)
182181 - Cohomological field theories, algebraic cycles, and moduli spaces (SNF)
184617 - Thermoakustische Instabilitäten in Rohr-Ringbrennkammern (SNF)
182181 - Cohomological field theories, algebraic cycles, and moduli spaces (SNF)
184617 - Thermoakustische Instabilitäten in Rohr-Ringbrennkammern (SNF)