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- W1685280763 abstract "Let M_{g,n}^rt be the moduli space of stable n-pointed curves of genus g>1 with rational tails. We also consider the space C_g^n classifying smooth curves of genus g with not necessarily distinct n ordered points. There is a natural proper map from M_{g,n}^rt to C_g^n which contracts all rational components. Tautological classes on these spaces are natural algebraic cycles reflecting the geometry of curves. In this short note we study the connection between tautological classes on M_{g,n}^rt and C_g^n. We show that there is a natural filtration on the tautological ring of M_{g,n}^rt consisting of g-2+n steps. A conjectural dictionary between tautological relations on M_{g,n}^rt and C_g^n is presented. Our conjecture predicts that the space of relations in R^*(M_{g,n}^rt) is generated by relations in R^*(C_g^n) together with a class of relations obtained from the geometry of blow-ups. This conjecture is equivalent to the the independence of certain tautological classes in Chow. We prove the analogue version of our conjecture for the Gorenstein quotients of tautological rings." @default.
- W1685280763 created "2016-06-24" @default.
- W1685280763 creator A5042283661 @default.
- W1685280763 date "2014-12-16" @default.
- W1685280763 modified "2023-09-27" @default.
- W1685280763 title "A conjectural connection between R^*(C_g^n) and R^*(M_{g,n}^rt)" @default.
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