• Medientyp: E-Artikel
  • Titel: On property (T) for Aut(Fn ) and SL n (ℤ)
  • Beteiligte: Kaluba, Marek; Kielak, Dawid; Nowak, Piotr W.
  • Erschienen: Annals of Mathematics, 2021
  • Erschienen in: Annals of Mathematics, 193 (2021) 2, Seite 539-562
  • Sprache: Englisch
  • DOI: 10.4007/annals.2021.193.2.3
  • ISSN: 1939-8980; 0003-486X
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  • Beschreibung: We prove that Aut(Fn ) has Kazhdan's property (T) for every n ⩾ 6. Together with a previous result of Kaluba, Nowak, and Ozawa, this gives the same statement for n ⩾ 5. We also provide explicit lower bounds for the Kazhdan constants of SAut(Fn ) (with n ⩾ 6) and of SL n (ℤ) (with n ⩾ 3) with respect to natural generating sets. In the latter case, these bounds improve upon previously known lower bounds whenever n > 6.