English

Filtration of cohomology via symmetric semisimplicial spaces

Algebraic Geometry 2023-08-14 v3 Algebraic Topology

Abstract

In the simplicial theory of hypercoverings, we replace the indexing category Δ\Delta by the \emph{symmetric simplicial category} ΔS\Delta S and study (a class of) ΔS\Delta S-hypercoverings, which we call \emph{spaces admitting symmetric (semi)simplicial filtration}. For ΔS\Delta S-hypercoverings we construct a spectral sequence, somewhat like the \v{C}ech-to-derived category spectral sequence. The advantage of working on ΔS\Delta S is that all of the combinatorial complexities that come with working on Δ\Delta are bypassed, giving simpler, unified proof of known results like the computation of (in some cases, stable) singular cohomology (with Q\mathbb{Q} coefficients) and et al e cohomology (with Q\mathbb{Q}_{\ell} coefficients) of the moduli space of degree nn maps CPrC\to \mathbb{P}^r, CC a smooth projective curve of genus gg, of unordered configuration spaces etc. as well as new: that of the moduli space of smooth sections of a fixed gdr\mathfrak{g}^r_d that is mm-very ample for some mm.

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Cite

@article{arxiv.1909.00458,
  title  = {Filtration of cohomology via symmetric semisimplicial spaces},
  author = {Oishee Banerjee},
  journal= {arXiv preprint arXiv:1909.00458},
  year   = {2023}
}

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