Inflation of fireballs, the gluon wind and the homogeneity of the HBT radii at RHIC

The ellipsoidally expanding fireball hydrodynamics with source terms in the momentum and energy equations is solved analytically, using the non-relativistic approximation. It is found that energy transport from high-pt jets of gluons to the medium leads to a transient, exponential inflation of the fireballs created in high energy heavy ion collisions. In this transient, inflatory period, the slopes of the single particle spectra are exponentially increasing, while the HBT radius parameters are exponentially decreasing with time. This effect is shown to be similar to the development of the homogeneity of our Universe due to an inflatory period. Independently of the initial conditions, and the exact value of freeze-out time and temperature, the measurables (single particle spectra, the correlation functions, slope parameters, elliptic flow, HBT radii and cross terms) become time-independent during the late, non-inflatory stages of the expansion, and they satisfy a new kind of scaling laws. If the expansion starts with a transient inflation caused by the gluon wind, it leads naturally to large transverse flows as well as to the simultaneous equality, and scaling behaviour of the HBT radius parameters, Rside ∼ Rout ∼ Rlong ∼ tf √Tf/m. With certain relativistic corrections, the scaling limit is τf √Tf/mt, where mt is the mean transverse mass of the pair. (author)