A high-contrast composite with annular inclusions: Norm-resolvent asymptotics

We investigate the operator-norm resolvent asymptotics of a high-contrast composite, consisting of a “stiff” material, with annular “soft” inclusions (a “stiff-soft-stiff” setup). This setup is derived from two models with very different effective wave propagation behaviours. Our analysis is based on an operator-framework proposed by Cherednichenko, Ershova, and Kiselev in [15]. Then, as a first step towards studying wave propagation on the stiff-soft-stiff composite, we use the effective description to derive analogous “dispersion functions”.