Localization conjecture for strongly self-absorbing equivariant \C^*-algebras

Let GG be a compact group and let DD be a strongly self-absorbing GG-C\mathrm{C}^*-algebra belonging to the GG-equivariant bootstrap class BG\mathcal{B}_G. A separable GG-C\mathrm{C}^*-algebra BB is compact if it is a compact object of the GG-equivariant Kasparov category KKGKK^G, meaning that for every countable family {Cn}n\{C_n\}_n of separable GG-C\mathrm{C}^*-algebras, the canonical map

nKKG(B,Cn)KKG(B,nCn)\bigoplus_n KK^G(B,C_n)\cong KK^G\left(B,\bigoplus_n C_n\right)

is an isomorphism. The algebra DD satisfies the localization condition with respect to BB if there exist R(G)R(G)-module isomorphisms

hiB:KKiG(B,C)SDKKiG(B,D),i=0,1,h_i^B:KK_i^G(B,\mathbb{C})_{S_D}\xrightarrow{\cong}KK_i^G(B,D),\qquad i=0,1,

that identify the natural localization maps with the maps induced by the unit ν:CD\nu:\mathbb{C}\to D.

Localization conjecture. DD satisfies the localization condition with respect to every separable compact GG-C\mathrm{C}^*-algebra BB.

This conjecture proposes a uniform localization description of equivariant Kasparov theory for strongly self-absorbing GG-C\mathrm{C}^*-algebras in the equivariant bootstrap class. Its resolution is not specified in the source.

Sources & referencesView supporting material

Primary source

Masaki Izumi and Keiya Ohara, “Toward the classification of strongly self-absorbing C^*-dynamical systems of compact groups”, arXiv:2603.12966 (2026).

Additional references

2 papers in this index state this conjecture (2013–2026). The statement above is taken from the most recent of them; the others are arXiv:1308.1718.

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