Figure 1

Transverse momentum spectra of $\pi {}^{+}$ in central collisions. The upper lines are for Pb-Pb collisions at $\sqrt{s}=2.76$ TeV and the lower lines are for Au-Au collisions at $200$ GeV. The dashed lines are for standard initial conditions and the solid lines are for the evolution starting with the pre-equilibrium flow; all calculations are in the relativistic viscous hydrodynamics. Data for Au-Au collisions are from the PHENIX Collaboration [23].Reuse & Permissions

Figure 2

Same as Fig. 1 but for $K^{+}$.Reuse & Permissions

Figure 3

STAR Collaboration data [25] (squares) for the HBT radii in central Au-Au collisions at $\sqrt{s}=200$ GeV compared to the results from viscous hydrodynamics with standard (dashed lines) and pre-equilibrium-flow initial conditions (solid lines).Reuse & Permissions

Figure 4

ALICE Collaboration data [5] (squares) for the HBT radii in central Pb-Pb collisions at $\sqrt{s}=2.76$ TeV compared to the results from viscous hydrodynamics with standard (dashed lines) and pre-equilibrium-flow initial conditions (solid lines).Reuse & Permissions