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Carrington, M. E.; Deja, Katarzyna; Mrówczyński, S.

doi:10.5506/aphyspolbsupp.5.947

Cited by 10 publications

(15 citation statements)

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“…The results in this paper have been used extensively in our analysis of parton energy loss in unstable QGP, a preliminary account of which is published as Refs. [19][20][21]. We hope that the analysis we have presented in this paper will facilitate computations of other characteristics of anisotropic QGP.…”

Section: Summary and Final Remarksmentioning

confidence: 97%

“…A particularly interesting quantity is the energy loss of a highly energetic parton traversing an unstable QGP, which depends crucially on the spectrum of collective excitations (a preliminary account of our energy-loss study can be found in Refs. [19][20][21]). Complete information about the collective modes of an anisotropic system is therefore important and useful.…”

Section: Introductionmentioning

confidence: 99%

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Plasmons in anisotropic quark-gluon plasma

2014

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Plasmons of quark-gluon plasma, or gluon collective modes, are systematically studied. The plasma is, in general, nonequilibrium but homogeneous. We consider anisotropic momentum distributions of plasma constituents which are obtained from the isotropic one by stretching or squeezing in one direction. This leads to prolate or oblate distributions, respectively. We study all possible degrees of one-dimensional deformation from the extremely prolate case, when the momentum distribution is infinitely elongated in one direction to the extremely oblate distribution, which is infinitely squeezed in the same direction. In between these extremes we discuss arbitrarily prolate, weakly prolate, isotropic, weakly oblate, and arbitrarily oblate distributions. For each case, the number of modes is determined using a Nyquist analysis and the complete spectrum of plasmons is found analytically if possible and numerically when not. Unstable modes are shown to exist in all cases except that of isotropic plasma. We derive conditions on the wave vectors for the existence of these instabilities. We also discuss stable modes which are not limited to small domains of wave vectors and therefore have an important influence on the system's dynamics.

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Section: Summary and Final Remarksmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Plasmons in anisotropic quark-gluon plasma

2014

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“…To compute the energy loss using the formula (28) we have to invert the matrix Σ defined by Eq. (21) or (23), which is the inverse gluon propagator in the temporal axial gauge. In isotropic plasmas the matrix depends on only one vector k. It can be decomposed into transverse and longitudinal components and is therefore easily inverted giving Eq.…”

Section: A Propagatormentioning

confidence: 99%

“…A preliminary account of our findings was published in the series of conference proceedings [21][22][23][24]. In these reports, we used a specific choice of initial conditions and we were not aware that our results crucially depend on this choice, to the extent that the test parton can not only loose energy in an unstable plasma, but could also gain the energy, depending on how the initial conditions are chosen.…”

Section: Introductionmentioning

confidence: 99%

Energy loss in unstable quark-gluon plasma

2015

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The momentum distribution of quark-gluon plasma at the early stage of a relativistic heavyion collision is anisotropic and consequently the system, which is assumed to be weakly coupled, is unstable due to chromomagnetic plasma modes. We consider a high-energy parton which flies across such an unstable plasma, and the energy transfer between the parton and the medium is studied as an initial value problem. In the case of equilibrium plasmas, the well-known formula of collisional energy loss is reproduced. The unstable plasma case is much more complex, and the parton can lose or gain energy depending on the initial conditions. The extremely prolate and extremely oblate systems are considered as examples of unstable plasmas, and two classes of initial conditions are discussed. When the initial chromodynamic field is uncorrelated with the color state of the parton, it typically looses energy, and the magnitude of the energy loss is comparable to that in an equilibrium plasma of the same density. When the initial chromodynamic field is induced by the parton, it can be either accelerated or decelerated depending on the relative phase factor. With a correlated initial condition, the energy transfer grows exponentially in time and its magnitude can much exceed the absolute value of energy loss in an equilibrium plasma. The energy transfer is also strongly directionally dependent. Consequences of our findings for the phenomenology of jet quenching in relativistic heavy-ion collisions are briefly discussed.

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“…[23][24][25]. In this work we consider a stable plasma, for which all modes are damped and there are no instabilities.…”

Section: Collisional Energy Lossmentioning

confidence: 99%

Heavy quark collisional energy loss in the quark-gluon plasma including finite relaxation time

2014

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In this paper, we calculate the soft-collisional energy loss of heavy quarks traversing the viscous quark-gluon plasma including the effects of a finite relaxation time τπ on the energy loss. We find that the collisional energy loss depends appreciably on τπ. In particular, for typical values of the viscosity-to-entropy ratio, we show that the energy loss obtained using τπ = 0 can be ∼ 10% larger than the one obtained using τπ = 0. Moreover, we find that the energy loss obtained using the kinetic theory expression for τπ is much larger that the one obtained with the τπ derived from the Anti de Sitter/Conformal Field Theory correspondence. Our results may be relevant in the modeling of heavy quark evolution through the quark-gluon plasma.

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Cited by 10 publications

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Plasmons in anisotropic quark-gluon plasma

Plasmons in anisotropic quark-gluon plasma

Energy loss in unstable quark-gluon plasma

Heavy quark collisional energy loss in the quark-gluon plasma including finite relaxation time

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