The equivariant K-theory classification conjecture for graph C*-algebras

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Let EE and FF be finite graphs. Write C∗(E)C^*(E) and C∗(F)C^*(F) for their graph C∗C^*-algebras, let γE\gamma_E and γF\gamma_F denote the gauge circle actions, and let K0TK_0^{\mathbb{T}} denote T\mathbb{T}-equivariant KK-theory. An order-preserving Z[x,x−1]\mathbb{Z}[x,x^{-1}]-module isomorphism is required to preserve the distinguished class of the unit.

Equivariant K-theory classification conjecture. There is an order-preserving Z[x,x−1]\mathbb{Z}[x,x^{-1}]-module isomorphism

ϕ:K0T(C∗(E))⟶∼K0T(C∗(F))\phi:K_0^{\mathbb{T}}(C^*(E))\overset{\sim}{\longrightarrow}K_0^{\mathbb{T}}(C^*(F))

with ϕ([C∗(E)])=[C∗(F)]\phi([C^*(E)])=[C^*(F)] if and only if there is a T\mathbb{T}-equivariant ∗*-isomorphism C∗(E)⟶∼C∗(F)C^*(E)\overset{\sim}{\longrightarrow}C^*(F).

This is the analytic counterpart of the graded classification conjecture, using the correspondence between graded KK-theory of Leavitt path algebras and equivariant KK-theory of graph C∗C^*-algebras. The source presents it as conjectural.

References

Primary source

Guillermo Cortiñas and Roozbeh Hazrat, “Classification conjectures for Leavitt path algebras”, arXiv:2401.04262 (2024).

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