Spectral naturality under quasi-containment

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Let GG be a locally compact group, and let τρ\tau_\rho denote the representation associated with a representation ρ\rho. A representation ρ\rho is spectrally natural when ΦA(ρ)=ΦA(ρ)\Phi_{\mathrm{A}(\rho)}=\Phi_{\mathrm{A}(\rho)}. Write σ≤qπ\sigma\leq_q\pi when σ\sigma is quasi-contained in π\pi, and let λ\lambda be the left regular representation. Spectral naturality conjecture. (i) If σ≤qπ\sigma\leq_q\pi and π\pi is spectrally natural, then σ\sigma is spectrally natural. (ii) If σ≤qλ\sigma\leq_q\lambda, then σ\sigma is spectrally natural. Part (ii) is presented as potentially useful for the examples developed later, but the source supplies no resolution of either assertion.

References

Primary source

Nico Spronk and Ross Stokke, “Matrix coefficients of unitary representations and associated compactifications”, arXiv:1112.4878 (2012).

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