Abstract
We give an explicit formula of the normalized Mumford form which expresses the second tautological line bundle by the Hodge line bundle defined on the moduli space of algebraic curves of any genus. This formula is represented as an infinite product which is a higher genus version of the Ramanujan delta function under the trivialization by normalized abelian differentials and Eichler integrals of their products. Furthermore, this formula gives a universal expression of the normalized Mumford form as a computable power series with integral coefficients by the moduli parameters of algebraic curves. Therefore, one can describe the behavior of this form and hence of the Polyakov string measure around the Deligne-Mumford boundary.
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This work is partially supported by the JSPS Grant-in-Aid for Scientific Research No. 17K05179.
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Ichikawa, T. An explicit formula of the normalized Mumford form. Lett Math Phys 111, 2 (2021). https://doi.org/10.1007/s11005-020-01339-0
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DOI: https://doi.org/10.1007/s11005-020-01339-0
Keywords
- Normalized Mumford form
- Moduli space of algebraic curves
- Ramanujan delta function
- Polyakov string measure