Gδ-dense binary sequences producing specific spectral types and dynamics
Identify whether there exists a dense Gδ subset of binary sequences c=(c_k)∈{0,1}^N such that, for the one-dimensional crystal with ν=1 and weight function w(k)=c_k/k^2 (extended symmetrically by w(−k)=w(k)), the associated operator H_Γ achieves a specific spectral type; additionally, determine the corresponding dynamical behavior.
References
Problem 9.4. For each c = (c ) ∈ {k,1} N, associate a weight function w(k) = k2 for k ∈ N and let w(−k) = w(k). Is there a dense G -set of cδ∈ {0,1} N such that the
corresponding Γ(c) has a specific spectral type ? Can we also understand the dynamics ?
— The curious spectra and dynamics of non-locally finite crystals
(2411.14965 - Kerner et al., 22 Nov 2024) in Section 9, Problem 9.4