Abstract
We study the effect of vorticity present in heavy ion collisions (HICs) on the temperature evolution of hot quark-gluon plasma in the presence of spin-vorticity coupling. The initial global rotation entails a nontrivial dependence of the longitudinal flow velocity on the transverse coordinates and also develops a transverse velocity component that depends upon the longitudinal coordinate. Both of these velocities lead to a 2+1 dimensional expansion of the fireball. It is observed that with finite vorticity and spin-polarization the fireball cools faster as compared to the case without vorticity. Furthermore, we discuss the consequence of this on the production of thermal dileptons.
Highlights
One of the most intriguing features of matter created in heavy-ion experiments at LHC and RHIC is the nearly ideal fluid behavior
We study the effect of vorticity present in heavy ion collisions (HICs) on the temperature evolution of hot quark gluon plasma in the presence of spin-vorticity coupling
We have analyzed the role of spinpolarization and vorticity on the evolution of the quark-gluon plasma (QGP) created in relativistic heavy-ion collisions
Summary
One of the most intriguing features of matter created in heavy-ion experiments at LHC and RHIC is the nearly ideal fluid behavior. The study of the polarization of Λ hyperon leads to an estimate of the vorticity ω ∼ ð9 Æ 1Þ × 1021 s−1 [5] This makes the matter created in the heavy-ion collision as the perfect vortical fluid. One of the manifestations of nonzero vorticity lies in the polarization of the secondary-particles [5,10,11,12,13,14], Another interesting effect is that of the quark and anti-quark global polarization due to the spin-orbit coupling [11]. We consider the effect of spin-vorticity coupling on the thermal evolution of the rotating fluid created in HIC experiments. II we calculate the vorticity evolution by employing the hydrodynamic analysis
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