Effective kinetic description of the expanding overoccupied glasma

Tanji, Naoto; Venugopalan, Raju

doi:10.1103/physrevd.95.094009

Cited by 31 publications

(38 citation statements)

References 73 publications

(163 reference statements)

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“…This functional form of the quark distribution at the scale p ⊥ ∼ Q s has been confirmed by us in a kinetic treatment a la BMSS [56]. We note that while quark pairs are produced copiously at early times, the gluon fusion process will continue to produce pairs as the system evolves, albeit at a diminishing rate, with this contribution amenable to a perturbative treatment in a kinetic approach [55,74].…”

Section: A Glasma Stage (I)mentioning

confidence: 62%

“…We note that while quark pairs are produced copiously at early times, the gluon fusion process will continue to produce pairs as the system evolves, albeit at a diminishing rate, with this contribution amenable to a perturbative treatment in a kinetic approach [55,74]. In weak coupling, this effect is negligible and the evolution of the quark spectrum is well described by the scaling form (34) [56]. Performing the same computation as in the gluon case, we can express the integral for quarks I q as…”

Section: A Glasma Stage (I)mentioning

confidence: 92%

“…Again, for a fixed box geometry, this computation has been done [55]. In an accompanying paper, we will discuss the extension of these results to that of the expanding Glasma [56].…”

mentioning

confidence: 99%

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Parametric estimate of the relative photon yields from the glasma and the quark-gluon plasma in heavy-ion collisions

Berges

Reygers²,

Tanji

et al. 2017

Phys. Rev. C

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Recent classical-statistical numerical simulations have established the "bottom-up" thermalization scenario of Baier et al. [1] as the correct weak coupling effective theory for thermalization in ultrarelativistic heavy-ion collisions. We perform a parametric study of photon production in the various stages of this bottom-up framework to ascertain the relative contribution of the off-equilibrium "Glasma" relative to that of a thermalized Quark-Gluon Plasma. Taking into account the constraints imposed by the measured charged hadron multiplicities at RHIC and the LHC, we find that Glasma contributions are important especially for large values of the saturation scale at both energies. These non-equilibrium effects should therefore be taken into account in studies where weak coupling methods are employed to compute photon yields.

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Section: A Glasma Stage (I)mentioning

confidence: 62%

Section: A Glasma Stage (I)mentioning

confidence: 92%

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Parametric estimate of the relative photon yields from the glasma and the quark-gluon plasma in heavy-ion collisions

Berges

Reygers²,

Tanji

et al. 2017

Phys. Rev. C

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“…The BEC can also occur because of an additional injection of non-equilibrium pions from resonance decays [35], decomposition of a blurred phase of hot baryon-poor and pion enriched matter existing before the chemical freezeout [36], sudden hadronization of supercooled quarkgluon plasma [37], and a decay of the transient Bose-Einstein condensate of gluons or glueballs pre-formed at an initial stage in a heavy-ion collision, cf. [38][39][40][41][42]. Reference [34] demonstrated that before the formation of the Bose-Einstein condensate the initially non-equilibrium interacting pion gas in ultrarelativistic heavy-ion collisions should pass several stages including a wave-turbulence stage.…”

Section: Introductionmentioning

confidence: 99%

Fluctuations in non-ideal pion gas with dynamically fixed particle number

Kolomeitsev

Voskresensky

2018

Nuclear Physics A

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We study the behavior of the non-ideal pion gas with the dynamically fixed number of particles, formed on an intermediate stage in ultra-relativistic heavy-ion collisions. The pion spectrum is calculated within the self-consistent Hartree approximation. General expressions are derived for cross-covariances of the number of various particle species in the pion gas of an arbitrary isospin composition. The behavior of the cross-variances is analyzed for the temperature approaching from above the maximal critical temperature of the Bose-Einstein condensation for the pion species a = ±, 0, i.e. for T > max T a cr . It is shown that in case of the system with equal averaged numbers of isospin species, the variance of the charge, Q = N+ − N−, diverges at T → Tcr = T a cr , whereas variances of the total particle number, N = N+ + N− + N0, and of a relative abundance of charged and neutral pions, G = (N+ + N−)/2 − N0, remain finite in the critical point. Then fluctuations are studied in the pion gas with small isospin imbalance 0 < |G| ≪ N and 0 < |Q| ≪ N and shifts of the effective masses, chemical potentials and values of critical temperatures are calculated for various pion species, and the highest critical temperature, maxT a cr is found, above which the pion system exists in the non-condensed phase. Various pion cross variances are calculated for T > maxT a cr , which prove to be strongly dependent on the isospin composition of the system, whereas the variances of N and G are found to be independent on the isospin imbalance up to the term linear in G/N and Q/N .

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“…We report on a numerical study of the kinetic equations for the nonequilibrium quark-gluon matter in the longitudinally expanding geometry [3].…”

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confidence: 99%

Effective kinetic description of the early-time dynamics in heavy-ion collisions

Tanji¹,

Venugopalan²

2017

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2017)

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In the idealized high-energy limit of heavy-ion collisions, the system right after a collision is described as an over-occupied gluonic plasma expanding in the longitudinal direction. The understanding of the quark dynamics in such a pre-equilibrium state is of prime importance since it has a direct connection to electromagnetic probes. We report on a numerical study of the Boltzmann equation including two-to-two scatterings of gluons and quarks in the expanding geometry. In the gluon sector, we confirm the self-similar scaling behavior of the one-particle momentum distribution that is consistent with the bottom-up thermalization scenario. Also in the quark sector, we find that the distribution function show scaling behavior like those of gluons.

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Effective kinetic description of the expanding overoccupied glasma

Cited by 31 publications

References 73 publications

Parametric estimate of the relative photon yields from the glasma and the quark-gluon plasma in heavy-ion collisions

Parametric estimate of the relative photon yields from the glasma and the quark-gluon plasma in heavy-ion collisions

Fluctuations in non-ideal pion gas with dynamically fixed particle number

Effective kinetic description of the early-time dynamics in heavy-ion collisions

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