Cohomology of affine artin groups and applications (Articolo in rivista)

Type
Label
  • Cohomology of affine artin groups and applications (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1090/S0002-9947-08-04488-7 (literal)
Alternative label
  • Callegaro F.; Moroni D.; Salvetti M. (2008)
    Cohomology of affine artin groups and applications
    in Transactions of the American Mathematical Society
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Callegaro F.; Moroni D.; Salvetti M. (literal)
Pagina inizio
  • 4169 (literal)
Pagina fine
  • 4188 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 360 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • In: Transactions of the American Mathematical Society, vol. 360 (8) pp. 4169 - 4188. American Mathematical Society, 2008. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 8 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Scuola Normale Superiore, CNR-ISTI, Pisa, CNR-ISTI, Pisa (literal)
Titolo
  • Cohomology of affine artin groups and applications (literal)
Abstract
  • The result of this paper is the determination of the cohomology of Artin groups of type A_n, B_n and A. _n with non-trivial local coefficients. The main result is an explicit computation of the cohomology of the Artin group of type B_n with coefficients over the module Q[q±1, t±1]. Here the first n - 1 standard generators of the group act by (-q)-multiplication, while the last one acts by (-t)-multiplication. The proof uses some technical results from previous papers plus computations over a suitable spectral sequence. The remaining cases follow from an application of Shapiro's lemma, by considering some well-known inclusions: we obtain the rational cohomology of the Artin group of affine type A. _n as well as the cohomology of the classical braid group Br_n with coefficients in the n-dimensional representation presented in Tong, Yang, and Ma (1996). The topological counterpart is the explicit construction of finite CW-complexes endowed with a free action of the Artin groups, which are known to be K(p, 1) spaces in some cases (including finite type groups). Particularly simple formulas for the Euler-characteristic of these orbit spaces are derived. (literal)
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