Interferometric signatures of the temperature dependence of the specific shear viscosity in heavy-ion collisions

Abstract

Recent work has shown that a temperature dependence of the shear viscosity to entropy ratio, $\eta /s$, influences the collective flow pattern in heavy-ion collisions in characteristic ways that can be measured by studying hadron transverse momentum spectra and their anisotropies. Here we point out that it also affects the pair momentum dependence of the Hanbury-Brown$-$Twiss (HBT) radii (the source size parameters extracted from two-particle intensity interferometry) and the variance of their event-by-event fluctuations. This observation establishes interferometric signatures as useful observables to complement the constraining power of single-particle spectra on the temperature dependence of $\eta /s$.

arXiv commentv2 - minor correction to Figure 6 and appropriate changes to relevant text v3 - improved calculations including p+p multiplicity fluctuations, implemented changes recommended by referee

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Cited by in corpus (10)

• Theoretical and Experimental Constraints for the Equation of State of Dense and Hot Matter
• The iEBE-VISHNU code package for relativistic heavy-ion collisions
• HoTCoffeeh: Hanbury Brown-Twiss correlation functions and radii from event-by-event hydrodynamics
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• An improved formula for Wigner function and spin polarization in a decoupling relativistic fluid at local thermodynamic equilibrium