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Filtration of cohomology via symmetric semisimplicial spaces

  • Oishee Banerjee

摘要

In the simplicial theory of hypercoverings we replace the indexing category \(\Delta \) Δ by the symmetric simplicial category \(\Delta S\) Δ S and study (a class of) \(\Delta _{\textrm{inj}}S\) Δ inj S -hypercoverings, which we call spaces admitting symmetric (semi)simplicial filtration—this special class happens to have a structure of a module over a graded commutative monoid of the form \(\textrm{Sym}\,M\) Sym M for some space M. For \(\Delta S\) Δ S -hypercoverings we construct a spectral sequence, somewhat like the Čech-to-derived category spectral sequence. The advantage of working with \(\Delta S\) Δ S over \(\Delta \) Δ is that various combinatorial complexities that come with working on \(\Delta \) Δ are bypassed, giving simpler, unified proof of results like the computation of (in some cases, stable) singular cohomology (with \(\mathbb {Q}\) Q coefficients) and étale cohomology (with \(\mathbb {Q}_{\ell }\) Q coefficients) of the moduli space of degree n maps \(C\rightarrow \mathbb {P}^r\) C P r with C a smooth projective curve of genus g, of unordered configuration spaces, of the moduli space of smooth sections of a fixed \(\mathfrak {g}^r_d\) g d r that is m-very ample for some m etc. In the special case when a \(\Delta _{\textrm{inj}}S\) Δ inj S -object X admits a symmetric semisimplicial filtration by M, we relate these moduli spaces to a certain derived tensor.