T-2, Nuclear and Particle Physics, Astrophysics and Cosmology

Independent Pair Model for Attractive Bose Systems

George E. Cragg
X-1, LANL

A bosonic analog of the independent pair approximation is developed in the context of a zero-temperature assembly with a positive s-wave scattering length, but attractive interparticle interactions. By preferentially scattering any pair back into the condensate, we account for the effect that all other particles have on the two-body state inside the medium. Instead of the energy of a pair, the poles of the resulting T matrix now give the chemical potential of the system. One pole reveals a collapsing many-body ground state whereas the other gives a complex valued chemical potential, where the imaginary part quantifies the decay rate of the condensate. Both solutions are in close agreement with those obtained in a variational calculation.

NNSA


Contact Us | Careers | Bradbury Science Museum | Emergencies | Inside LANL | Maps | Site Feedback | SSL Portal | Training

Operated by Los Alamos National Security, LLC for the U.S. Department of Energy's NNSA© Copyright 2010-11 LANS, LLC All rights reserved | Terms of Use | Privacy Policy