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 $\eta /s$.

v2 - minor correction to Figure 6 and appropriate changes to relevant text v3 - improved calculations including p+p multiplicity fluctuations, implemented changes recommended by referee

References in corpus (8)

• Systematic parameter study of hadron spectra and elliptic flow from viscous hydrodynamic simulations of Au+Au collisions at sqrt(s_NN) = 200 GeV
• Resolving the HBT Puzzle in Relativistic Heavy Ion Collision
• Causal Viscous Hydrodynamics for Central Heavy-Ion Collisions II: Meson Spectra and HBT Radii
• Femtoscopy in hydro-inspired models with resonances
• Influence of temperature dependent shear viscosity on elliptic flow at back- and forward rapidities in ultrarelativistic heavy-ion collisions
• Rapid hydrodynamic expansion in relativistic heavy-ion collisions
• Fitted HBT radii versus space-time variances in flow-dominated models
• Does interferometry probe thermalization?

Cited by in corpus (4)

• Theoretical and Experimental Constraints for the Equation of State of Dense and Hot Matter
• Hanbury Brown--Twiss Interferometry and Collectivity in Small Systems
• The Multiplicity Dependence of Pion Interferometry in Hydrodynamics
• An improved formula for Wigner function and spin polarization in a decoupling relativistic fluid at local thermodynamic equilibrium