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We study the effects of bulk viscosity on p_T spectra and elliptic flow inheavy ion collisions at RHIC. We argue that direct effect of the bulk viscosityon the evolution of the velocity field is small, but corrections to thefreezeout distributions can be significant. These effects are dominated bychemical non-equilibration in the hadronic phase. We show that a non-zero bulkviscosity in the range $\zeta/s \lsim 0.05$ improves the description of spectraand flow at RHIC.

Bulk viscosity, chemical equilibration and flow at RHIC