Long-range gravitational-like interaction in a neutral atomic cold gas
  A quasi-resonant laser induces a long-range attractive force within a cloud of cold atoms. We take advantage of this force to build in the laboratory a system of particles with a one-dimensional gravitational-like interaction, at a fluid level of modeling. We give experimental evidences of such an interaction in a cold Strontium gas, studying the density profile of the cloud, its size as a function of the number of atoms, and its breathing oscillations. 
Maryvonne Chalony (INLN), J. Barre (JAD), B. Marcos (JAD), A. Olivetti   (JAD), David Wilkowski (INLN, CQT, PAP)
physics.atom-ph cond-mat.quant-gas cond-mat.stat-mech