Thermal and transport properties in central heavy-ion reactions around a few hundred MeV/nucleon

Deng, Xian-Gai; Ma, Yugang; Veselský, M.

doi:10.1103/physrevc.94.044622

Cited by 18 publications

(16 citation statements)

References 73 publications

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“…The minimum in this picture is related to the breakdown of the hydrodynamics expansion [30]. A minimum for η/s was also discussed in holographic models where it corresponds to a transition between thermal gas background and a big black hole solution at high temperature [31], and in certain nuclear matter models [32,33].…”

Section: Kinematic Viscositymentioning

confidence: 98%

Similarity between the kinematic viscosity of quark-gluon plasma and liquids at the viscosity minimum

2021

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Recently, it has been found that the kinematic viscosity of liquids at the minimum, \nu_mνm, can be expressed in terms of fundamental physical constants, giving \nu_mνm on the order of 10^{-7}~{m^2/s}10−7m2/s. Here, we show that the kinematic viscosity of quark-gluon plasma (QGP) has a similar value and support this finding by experimental data and theoretical estimations. The similarity is striking, given that the dynamic viscosity and the density of QGP are about 16 orders of magnitude larger than in liquids and that the two systems have disparate interactions and fundamental theories. We discuss the implications of this result for understanding the QGP including the similarity of flow and particle dynamics at the viscosity minimum, the associated dynamical crossover and universality of shear diffusivity.

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Section: Kinematic Viscositymentioning

confidence: 98%

Similarity between the kinematic viscosity of quark-gluon plasma and liquids at the viscosity minimum

2021

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“…The minimum in this picture is related to the breakdown of the hydrodynamics expansion [29]. A minimum for η/s was also discussed in holographic models where it corresponds to a transition between thermal gas background and a big black hole solution at high temperature [30], and in certain nuclear matter models [31,32].…”

Section: Kinematic Viscositymentioning

confidence: 98%

Report on scipost_202012_00017v1

2021

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Recently, it has been found that the kinematic viscosity of liquids at the minimum, ν m , can be expressed in terms of fundamental physical constants, giving ν m on the order of 10 −7 m 2 /s. Here, we show that the kinematic viscosity of quark-gluon plasma (QGP) has a strikingly similar value and support this finding by experimental data and theoretical estimations. We discuss the implications of this result for understanding the QGP including the similarity of its shear flow to that in liquids at the viscosity minimum. The similarity may also indicate that the QGP is close to the dynamical crossover. Our results provide quantitative evidence for the universality of the shear diffusivity proposed earlier.

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“…At zero temperature, the properties of nuclear matter have been studied extensively, and its equation of state (EOS), including its isospin dependence, i.e., symmetry energy, has been determined relatively well [1][2][3], while its properties at finite temperature are relatively little touched upon. Among these properties, two noticeable examples are the nuclear liquid-gas phase transition [4][5][6][7][8][9][10][11][12][13][14][15][16] and the temperature dependence of the ratio of shear viscosity to entropy density (η/s) [17][18][19][20][21][22]. The latter is also connected to the nuclear giant dipole resonance at finite temperature [23][24][25], since both of them are related to the two-body dissipation of nucleons.…”

Section: Introductionmentioning

confidence: 99%

Determining the temperature in heavy-ion collisions with multiplicity distribution

Song,

Wang,

et al. 2021

Preprint

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By relating the charge multiplicity distribution and the temperature of a de-exciting nucleus through a deep neural network, we propose that the charge multiplicity distribution can be used as a thermometer of heavy-ion collisions. Based on an isospin-dependent quantum molecular dynamics model, we study the caloric curve of reaction 103 Pd + 9 Be with the apparent temperature determined through the charge multiplicity distribution. The caloric curve shows a characteristic signature of nuclear liquid-gas phase transition around the apparent temperature Tap = 6.4 MeV, which is consistent with that through a traditional heavy-ion collision thermometer, and indicates the viability of determining the temperature in heavy-ion collisions with multiplicity distribution.

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Thermal and transport properties in central heavy-ion reactions around a few hundred MeV/nucleon

Cited by 18 publications

References 73 publications

Similarity between the kinematic viscosity of quark-gluon plasma and liquids at the viscosity minimum

Similarity between the kinematic viscosity of quark-gluon plasma and liquids at the viscosity minimum

Report on scipost_202012_00017v1

Determining the temperature in heavy-ion collisions with multiplicity distribution

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