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Amalgamated Products of Strongly RFD C∗-algebras arising from locally compact groups

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Amalgamated Products of Strongly RFD C∗-algebras arising from locally compact groups
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17
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CC Attribution - NonCommercial - NoDerivatives 4.0 International:
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Residual finite dimensionality is the C∗-algebraic analogue for maximal almost periodicity and residual finiteness for groups. Just as with the analogous group-theoretic properties, there is significant interest in when residual finite dimensionality is preserved under standard constructions, in particular amalgamated free products. In general, this question is quite difficult; however the answer is known when the amalgam is finite dimensional or when the two C∗-algebras are commutative. In moving beyond these cases, group theoretic restrictions suggest that we consider central amalgams. We generalize the commutative case to pairs of so-called ``strongly residually finite dimensional" C∗-algebras amalgamated over a central subalgebra. Examples of strongly residually finite dimensional C∗-algebras include group C∗-algebras associated to virtually abelian groups, certain just-infinite groups, and Lie groups with only finite dimensional irreducible unitary representations. Though this property may seem restrictive, a recent result of Thom indicates that it is in fact necessary. This is joint work with Tatiana Shulman.