Kaad's pure-state separation conjecture for Hilbert CC^*-modules

Let A\mathscr A be a CC^*-algebra, let E\mathscr E be a Hilbert CC^*-module over A\mathscr A, and let L\mathscr L be a closed A\mathscr A-submodule of E\mathscr E. For a state ω\omega on A\mathscr A, write ιω:EEω\iota_\omega:\mathscr E\to\mathscr E_\omega for the canonical map to the Hilbert-space localization, and let S(A)S(\mathscr A) denote the state space of A\mathscr A. Kaad's pure-state separation conjecture. In this situation, there exist a pure state ω\omega and an element x0Ex_0\in\mathscr E such that ιω(x0)\iota_\omega(x_0) is not in the closure of ιω(L)\iota_\omega(\mathscr L). In particular, there exists a pure state ω\omega such that ιω(L)\iota_\omega(\mathscr L) is not dense in Eω\mathscr E_\omega, and hence

ιω(L)0.\iota_\omega(\mathscr L)^\perp\neq 0.

The conjecture concerns strengthening the corresponding separation theorem from states to pure states; the source context says that Kaad and Lesch provided a positive answer, so the conjecture is treated as solved.

Sources & referencesView supporting material

Primary source

Rasoul Eskandari and Mohammad Sal Moslehian, “A separation theorem for Hilbert W^*-modules”, arXiv:2405.04850 (2024).

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