Shear-induced spin polarization in heavy-ion collisions

Fu, Baochi; Liu, Shuai Y. F.; Pang, Longgang; Song, Huichao; Yin, Yi

doi:10.48550/arxiv.2103.10403

Cited by 11 publications

(23 citation statements)

References 43 publications

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“…[299,300] for related studies). Whereby the numerical simulations yield the results in quantitative agreement with experimental data by tuning appropriate parameters [294,295]. However, there are a few problems that remain unsettled such as the sensitivity to the equation of state and the temperature gradient in hydrodynamical simulations [301,300,302].…”

Section: Introductionmentioning

confidence: 71%

“…In particular, the shear correction, which has been further derived from the linear-response theory and statistical quantum field theory for massive fermions [296,297,298] (see also Ref. [299]), leads to a substantial contribution to the local spin polarization along the beam direction as shown by hydrodynamic simulations [294,295,301] (see also Ref. [279] for simulations with the chemical-potential gradient).…”

Section: Discussionmentioning

confidence: 98%

“…We see that the term Ω p × (∂n p /∂x) implies that an inhomogeneous distribution function can also lead to a current. Recently, such a term provides new sources for the local spin polarization, e.g., the polarization induced by the shear viscous term and gradient of the chemical potential over temperature [173,297,294,298,295,279].…”

Section: 47)mentioning

confidence: 99%

“…This inconsistency cannot be explained by feed-down effects [290,291,292]. There have been some phenomenological models in an attempt to describe the data [188,276,293,294,295] but with external assumptions. It has been realized that the freezeout formula in terms of thermal vorticity based on the equilibrium condition (the Killing equation for the thermal velocity) may not be valid in a hydrodynamical simulation of the QGP, implying a possible off-equilibrium contribution to the local polarization [276].…”

Section: Introductionmentioning

confidence: 99%

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Foundations and Applications of Quantum Kinetic Theory

Hidaka,

Pu,

Wang

et al. 2022

Preprint

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Many novel quantum phenomena emerge in non-equilibrium relativistic quantum matter under extreme conditions such as strong magnetic fields and rotations. The quantum kinetic theory based on Wigner functions in quantum field theory provides a powerful and effective microscopic description of these quantum phenomena. In this article we review some of recent advances in the quantum kinetic theory and its applications in describing these quantum phenomena.

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Section: Introductionmentioning

confidence: 71%

Section: Discussionmentioning

confidence: 98%

Section: 47)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Foundations and Applications of Quantum Kinetic Theory

Hidaka,

Pu,

Wang

et al. 2022

Preprint

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“…In the future, one may use this integrated model to test the equation of state with finite net baryon density [67,68,75]. Our realistic hydrodynamics simulation can also provide the temperature and flow (gradient) profiles of the QGP, which are important inputs for studying jet quenching [86][87][88][89][90][91][92] and the global/local polarizations [93][94][95][96][97][98][99][100][101][102][103] in relativistic heavy-ion collisions. To further improve our model, we may use dynamical initial conditions [58,104] and include pre-equilibrium evolution [56,57] in our event-by-event CLVisc hydrodynamics framework.…”

Section: Discussionmentioning

confidence: 99%

(3+1)-D viscous hydrodynamics CLVisc at finite net baryon density: identified particle spectra, anisotropic flows and flow fluctuations across BES energies

Wu,

Qin,

Pang

et al. 2021

Preprint

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To study the bulk properties of the quark-gluon-plasma (QGP) produced at the beam energy scan (BES) energies at the Relativistic Heavy Ion Collider (RHIC), we extend the (3+1)-dimensional viscous hydrodynamics CLVisc to include net baryon number conservation and Israel-Stewart-like equation for baryon diffusion with the NEOS-BQS equation of state, fluctuating initial conditions from Monte-Carlo Glauber model, and the afterburner SMASH. This integrated framework is shown to provide a good description of identified particle spectra, mean transverse momenta and anisotropic flows for different centralities and over a wide range of collision energies (7.7-62.4 GeV). It is found that the mean momenta of identified particles and anisotropic flows increases mildly with the collision energy due to larger radial flow. We further compute the multiple-particle cumulant ratio v2{4}/v2{2} of elliptic flow across BES energies, and find that the relative fluctuations of elliptic flow are insensitive to the collision energy, consistent with the preliminary STAR data. Our model provides a benchmark for understanding the RHIC-BES data and studying the critical properties and phase structure of hot and dense QCD matter.

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Local Polarization and Isothermal Local Equilibrium in Relativistic Heavy Ion Collisions

et al. 2021

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We show that the inclusion of a recently found additional term of the spin polarization vector at local equilibrium which is linear in the symmetrized gradients of the velocity field, and the assumption of hadron production at constant temperature restore the quantitative agreement between hydrodynamic model predictions and local polarization measurements in relativistic heavy ion collisions at √ sNN = 200 GeV. The longitudinal component of the spin polarization vector turns out to be very sensitive to the temperature value, with a good fit around 155 MeV. The implications of this finding are discussed.

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Shear-induced spin polarization in heavy-ion collisions

Cited by 11 publications

References 43 publications

Foundations and Applications of Quantum Kinetic Theory

Foundations and Applications of Quantum Kinetic Theory

(3+1)-D viscous hydrodynamics CLVisc at finite net baryon density: identified particle spectra, anisotropic flows and flow fluctuations across BES energies

Local Polarization and Isothermal Local Equilibrium in Relativistic Heavy Ion Collisions

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