Strong self-absorption criterion for coronas

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Let AA and DD be separable and unital C∗\mathrm{C}^*-algebras, with DD strongly self-absorbing. For a C∗\mathrm{C}^*-algebra BB, write Q(B)=M(B)/B\mathcal Q(B)=\mathcal M(B)/B for its corona algebra, and let S′S' denote the commutant of SS. Strong self-absorption criterion for coronas. The following are equivalent:

A⊗D≅A.A\otimes D\cong A.

For every separable C∗\mathrm{C}^*-subalgebra SS of Q(A⊗K)\mathcal Q(A\otimes\mathcal K), there is a unital embedding

D↪Q(A⊗K)∩S′.D\hookrightarrow \mathcal Q(A\otimes\mathcal K)\cap S'.

This is proposed as an analogue for corona algebras of the corresponding characterization of tensorial absorption. The supplied text gives no resolution, so the conjecture remains open.

References

Primary source

Ilijas Farah, “Calkin algebra, Kazhdan's property (T), strongly self-absorbing C*-algebras”, arXiv:2208.12301 (2023).

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