The influence of g bosons on the interacting boson model

A study is made of the alteration in energy spectra after g bosons are added to the interacting boson model, when the model is taken to the SU(3) limit.     

Short-range-order lifetime and the "boson peak" in a metallic glass model

We extend the usual static view of short range order in metallic glasses to a dynamical model of local order. We use an atomistic simulation of a NiZr glass to investigate time-dependent fluctuations of the atomic environment. We show that, even in the "frozen" glass, the solute-centered clusters change their identities between distinct polyhedron types. The frequency spectrum of these transitions exhibits a characteristic peak which we show to be related to a universal vibrational anomaly of disordered solids: the controversial boson peak.