Operator biflatness of the Fourier algebra and approximate indicators for subgroups

Aristov, Oleg Yu.; Runde, Volker; Spronk, Nico

Operator biflatness of the Fourier algebra and approximate indicators for subgroups

Authors

Aristov, Oleg Yu.

Runde, Volker

Spronk, Nico

Description

We investigate if, for a locally compact group $G$, the Fourier algebra $A(G)$ is biflat in the sense of quantized Banach homology. A central role in our investigation is played by the notion of an approximate indicator of a closed subgroup of $G$: The Fourier algebra is operator biflat whenever the diagonal in $G \times G$ has an approximate indicator. Although we have been unable to settle the question of whether $A(G)$ is always operator biflat, we show that, for $G = SL(3,C)$, the diagonal in $G \times G$ fails to have an approximate indicator.
23 pages; more typos removed; references updated