Polynomial families of tautological classes on $\mathcal{M}_{g,n}^{rt}$

Details Polynomial families of tautological classes on $\mathcal{M}_{g,n}^{rt}$ Polynomial families of tautological classes on $\mathcal{M}_{g,n}^{rt}$

2011-07-05

arxiv.org/abs/1107.0857v1

Mathematics

Algebraic Geometry

43 pages, 4 figures

Scientific paper

We study classes $P_{g,T}(\alpha;\beta)$ on the moduli space of stable, genus g curves with rational tails defined by pushing forward the virtual fundamental classes of spaces of relative stable maps to an unparameterized projective line. A comparison with classes $Q_{g,T}$ arising from sections of the universal Jacobian shows the classes $P_{g,T}(\alpha;\beta)$ are polynomial in the parts of the partitions indexing the special ramification data. Virtual localization on moduli spaces of relative stable maps gives sufficient relations to compute the coefficients of these polynomials in various cases.

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