Injective cogenerators among operator bimodules

Details Injective cogenerators among operator bimodules Injective cogenerators among operator bimodules

2005-08-29

arxiv.org/abs/math/0508566v1

Mathematics

Operator Algebras

21 pages

Scientific paper

Given C$^*$-algebras $A$ and $B$ acting cyclically on Hilbert spaces $\h$ and $\k$, respectively, we characterize completely isometric $A,B$-bimodule maps from $\bkh$ into operator $A,B$-bimodules. We determine cogenerators in some classes of operator bimodules. For an injective cogenerator $X$ in a suitable category of operator $A,B$-bimodules we show: if $A$, regarded as a C$^*$-subalgebra of $\al(X)$ (adjointable left multipliers on $X$), is equal to its relative double commutant in $\al(X)$, then $A$ must be a W$^*$-algebra.

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