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Transactions of the American Mathematical Society

ISSN 1088-6850(online) ISSN 0002-9947(print)

 
 

 

Cohomology of the symplectic group $\textrm {Sp}_ 4(\textbf {Z})$. I. The odd torsion case


Authors: Alan Brownstein and Ronnie Lee
Journal: Trans. Amer. Math. Soc. 334 (1992), 575-596
MSC: Primary 11F75; Secondary 11F46, 32G15
DOI: https://doi.org/10.1090/S0002-9947-1992-1055567-X
MathSciNet review: 1055567
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Abstract: Let ${h_2}$ be the degree two Siegel space and $Sp(4,\mathbb {Z})$ the symplectic group. The quotient $Sp(4,\mathbb {Z})\backslash {h_2}$ can be interpreted as the moduli space of stable Riemann surfaces of genus $2$. This moduli space can be decomposed into two pieces corresponding to the moduli of degenerate and nondegenerate surfaces of genus $2$. The decomposition leads to a Mayer-Vietoris sequence in cohomology relating the cohomology of $Sp(4,\mathbb {Z})$ to the cohomology of the genus two mapping class group $\Gamma _2^0$. Using this tool, the $3$- and $5$-primary pieces of the integral cohomology of $Sp(4,\mathbb {Z})$ are computed.


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Article copyright: © Copyright 1992 American Mathematical Society