  We investigate the effects of finite baryon chemical potential on the
transport properties of a hadron resonance gas. We find that a hadron resonance
gas with large baryon number density is closer to the ideal fluid limit than
the corresponding gas with zero baryon number. This suggests that the system
created at the Relativistic Heavy Ion Collider (RHIC) at lower collision
energies may behave as a fluid, with an effective fluidity close to the one
found at RHIC's highest energy near phase transition. This might explain why
the differential elliptic flow coefficient measured at lower collisional
energies at RHIC is similar to the one observed at high energies.

Nuclear Theory;High Energy Physics - Phenomenology