Cohomological invariants and R-triviality of adjoint classical groups

Berhuy, Grégory ; Monsurrò, Marina ; Tignol, Jean-Pierre

In: Mathematische Zeitschrift, 2004, vol. 248, no. 2, p. 313-323

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    Summary
    Abstract.: Using a cohomological obstruction, we construct examples of absolutely simple adjoint classical groups of type 2An with n≡3mod4, Cn or 1Dn with n≡0mod4, which are not R-trivial hence not stably rational