Title: Subwavelength phononic bandgap opening in bubbly media,
Abstract: The aim of this paper is to show both analytically and numerically the
existence of a subwavelength phononic bandgap in bubble phononic crystals. The
key is an original formula for the quasi-periodic Minnaert resonance
frequencies of an arbitrarily shaped bubble. The main findings in this paper
are illustrated with a variety of numerical experiments.