Effect of bulk viscosity on interferometry correlations in ultrarelativistic heavy-ion collisions

Abstract

A temperature dependent bulk viscosity coefficient is used in 3+1D hydrodynamic simulations. I study the effect of the increase of bulk viscosity around the critical temperature on the system dynamics in central Pb+Pb collisions at $\sqrt{s_{NN}}=2760$~GeV. With increasing bulk viscosity the life-time of the system increases slightly. Also the shape of the freeze-out hypersurface changes, the outer layers of the fireball live longer. This effect causes a small reduction of the ratio of two interferometry radii $R_{out}/R_{side}$, improving the agreement with experimental data.

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• Pion-kaon femtoscopy in Pb--Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV modeled in (3+1)D hydrodynamics coupled to Therminator 2 and the effect of delayed kaon emission
• Squeezed back-to-back correlation of $\bqD^0{\bar \bqD}^0$ in relativistic heavy-ion collisions
• Bulk viscosity in strong and electroweak matter
• New, spherical solutions of non-relativistic, dissipative hydrodynamics