Relativistic dissipative spin dynamics in the relaxation time approximation

Bhadury, Samapan; Florkowski, Wojciech; Jaiswal, Amaresh; Kumar, Avdhesh; Ryblewski, Radosław

doi:10.1016/j.physletb.2021.136096

Cited by 116 publications

(60 citation statements)

References 41 publications

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“…However, the recent experimental observation of spin polarization of hadrons in relativistic heavy-ion collisions [7][8][9][10] strongly motivates the development of the theory describing spin transport in relativistic plasma, in particular, the quark-gluon plasma (QGP). This motivation has led to several theoretical studies of relativistic hydrodynamics with spin polarization, based on the second law of thermodynamics [11][12][13][14][15], equilibrium partition functions [15], quantum kinetic theory of relativistic fermions [16][17][18][19][20][21][22][23][24][25], holographic approach for strongly-coupled plasma [26][27][28], effective Lagrangian approach [29][30][31][32], and JHEP11(2021)150 quantum statistical density operators [33][34][35][36][37] (see also refs. [38][39][40] and references therein for a review).…”

Section: Introductionmentioning

confidence: 99%

Relativistic spin hydrodynamics with torsion and linear response theory for spin relaxation

Hongo

Huang

Kaminski

et al. 2021

J. High Energ. Phys.

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Using the second law of local thermodynamics and the first-order Palatini formalism, we formulate relativistic spin hydrodynamics for quantum field theories with Dirac fermions, such as QED and QCD, in a torsionful curved background. We work in a regime where spin density, which is assumed to relax much slower than other non-hydrodynamic modes, is treated as an independent degree of freedom in an extended hydrodynamic description. Spin hydrodynamics in our approach contains only three non-hydrodynamic modes corresponding to a spin vector, whose relaxation time is controlled by a new transport coefficient: the rotational viscosity. We study linear response theory and observe an interesting mode mixing phenomenon between the transverse shear and the spin density modes. We propose several field-theoretical ways to compute the spin relaxation time and the rotational viscosity, via the Green-Kubo formula based on retarded correlation functions.

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Section: Introductionmentioning

confidence: 99%

Relativistic spin hydrodynamics with torsion and linear response theory for spin relaxation

Hongo

Huang

Kaminski

et al. 2021

J. High Energ. Phys.

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“…Throughout this paper, we focus on the ratio R ¯ / = P ¯ /P of the antihyperon to hyperon spin polarization, in which many quantitative factors cancel out. For this reason, we will not consider more complex phenomena which may have an important quantitative impact on the polarization magnitude, such as the nontrivial transport of charge and polarization [31,32] or the shear-vorticity coupling [33,34], which may be expected to have an important role in the development of the longitudinal polarization due to the dynamics in the transverse plane. Our analysis in this paper neglects such effects and we focus exclusively on the global polarization.…”

Section: Introductionmentioning

confidence: 99%

Hyperon–anti-hyperon polarization asymmetry in relativistic heavy-ion collisions as an interplay between chiral and helical vortical effects

Ambruş

Chernodub

2022

Eur. Phys. J. C

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We argue that the enhancement in the spin polarization of anti-hyperons compared to the polarization of the hyperons in noncentral relativistic heavy-ion collisions arises as a result of an interplay between the chiral and helical vortical effects. The chiral vortical effect generates the axial current of quarks along the vorticity axis while the recently found helical vortical effect generates the helicity flow – the projection of the quark’s polarization vector onto its momentum – along the same axis. For massless fermions, the helical charge corresponds to a difference in the contributions of particles and anti-particles to the axial charge. Assuming that the spin of light quarks transfers to the strange quarks via the vector kaon states (“the spin-vector dominance”), we are able to describe the ratio of the (anti)hyperon spin polarizations, obtained by the STAR group, without fitting parameters. We also argue that the helical vortical effect dominates over the chiral vortical effect and the chiral magnetic effect in the generation of the electric current.

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“…The recent measurements of the spin polarization of particles emitted in non-central relativistic heavy-ion collisions [1][2][3][4] are quite often listed among the most interesting experimental findings in contemporary high-energy physics [5][6][7][8][9]. The quantum nature of these phenomena provides new insights into the properties of the hot and dense strongly-interacting matter and triggers many new theoretical developments [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. Apart from theoretical challenges, the experimental procedures employed to measure the new phenomena also require better understanding [26].…”

Section: Introductionmentioning

confidence: 99%