Optically-Induced Polarons in Bose-Einstein Condensates: Monitoring   Composite Quasiparticle Decay
  Nonresonant light-scattering off atomic Bose-Einstein condensates (BECs) is predicted to give rise to hitherto unexplored composite quasiparticles: unstable polarons, i.e., local ``impurities'' dressed by virtual phonons. Optical monitoring of their spontaneous decay can display either Zeno or anti-Zeno deviations from the Golden Rule, and thereby probe the temporal correlations of elementary excitations in BECs. 
I. E. Mazets, G. Kurizki, N. Katz, and N. Davidson