Collective excitations of a hot anisotropic QCD medium with the Bhatnagar-Gross-Krook collisional kernel within an effective description

Kumar, Avdhesh; Jamal, Mohammad Yousuf; Chandra, Vinod; Bhatt, Jitesh R.

doi:10.1103/physrevd.97.034007

Cited by 31 publications

(18 citation statements)

References 96 publications

(102 reference statements)

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“…which is very close to the recent lattice results [54,55]. These EoSs have been carefully embedded in z q and z q for both isotropic and to anisotropic hot QCD medium [56,57]. z q and z q have complicated temperature dependence as discussed in Ref.…”

Section: Asupporting

confidence: 84%

Bulk viscosity of a hot QCD medium in a strong magnetic field within the relaxation-time approximation

Kurian

Chandra

2018

Phys. Rev. D

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The bulk viscosity of hot QCD medium has been obtained in the presence of strong magnetic field. The present investigation involves the estimation of the quark damping rate and subsequently the thermal relaxation time for quarks in the presence of magnetic field while realizing the hot QCD medium as an effective Grand-canonical ensemble of effective gluons and quarks-antiquarks. The dominant process in the strong field limit is 1 → 2 (g → qq) which contributes to the bulk viscosity in a most significant way. Further, setting up the linearized transport equation in the framework of an effective kinetic theory with hot QCD medium effects and employing the relaxation time approximation, the bulk viscosity has been estimated in lowest Landau level (LLL) and beyond. The temperature dependence of the ratio of the bulk viscosity to entropy density indicates towards its rising behavior near the transition temperature.

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Section: Asupporting

confidence: 84%

Bulk viscosity of a hot QCD medium in a strong magnetic field within the relaxation-time approximation

Kurian

Chandra

2018

Phys. Rev. D

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“…The hot QCD EoSs described here are the recent (2 + 1)-lattice EoS from hot QCD collaboration [43], and the 3-loop HTL perturbative EoS that has been computed by Haque et al [44,45] which agrees reasonably well with the lattice results [43,46]. The EQPM has already been successfully applied to study the various aspects of hot QCD medium [47][48][49][50][51][52][53]. In the present case, at finite quark chemical potential, the momentum distributions of gluon, quark, and anti-quark are given as,…”

Section: Extended Eqpm To Incorporate the Medium Interaction And The Finite Quark Chemical Potentialsupporting

confidence: 71%

Passage of heavy quarks through the fluctuating hot QCD medium

Jamal

Mohanty

2021

Eur. Phys. J. C

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The change in the energy of the moving heavy (charm and bottom) quarks due to field fluctuations present in the hot QCD medium has been studied. A finite quark chemical potential has been considered while modeling the hot QCD medium counting the fact that the upcoming experimental facilities such as Facility for Anti-proton and Ion Research (FAIR) and Nuclotron-based Ion Collider fAcility (NICA) are expected to operate at finite baryon density and moderate temperature. The effective kinetic theory approach has been adopted where the collisions have been incorporated using the well-defined collisional kernel, known as Bhatnagar–Gross–Krook (BGK). To incorporate the non-ideal equations of state (EoSs) effects/medium interaction effects, an extended effective fugacity model has been adopted. The momentum dependence of the energy change due to fluctuation for the charm and bottom quark has been investigated at different values of collision frequency and chemical potential. The results are exciting as the heavy quarks are found to gain energy due to fluctuations while moving through the produced medium at finite chemical potential and collision frequency.

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“…The presence of shear viscosity also can contribute to such momentum-space anisotropy, thus the anisotropy can survive a long time [72]. There are some studies to explore the influence of momentum-anisotropy induced by the initial spatial expansion on various transport coefficients [65][66][67], collective excitations of hot QCD medium [68][69][70][71] and quarkonium bound state [72][73][74][75][76]. Apart from the initial spatial expansion-driven momentum anisotropy, the momentum anisotropy also can be induced by strong magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric properties of the (an-)isotropic QGP in magnetic fields

2021

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The Seebeck effect and the Nernst effect, which reflect the appearance of electric fields along x-axis and along y-axis ($$E_{x}$$ E x and $$E_{y}$$ E y ), respectively, induced by the thermal gradient along x-axis, are studied in the QGP at an external magnetic field along z-axis. We calculate the associated Seebeck coefficient ($$S_{xx}$$ S xx ) and Nernst signal (N) using the relativistic Boltzmann equation under the relaxation time approximation. In an isotropic QGP, the influences of magnetic field (B) and quark chemical potential ($$\mu _{q}$$ μ q ) on these thermoelectric transport coefficients are investigated. In the presence (absence) of weak magnetic field, we find $$S_{xx}$$ S xx for a fixed $$\mu _{q}$$ μ q is negative (positive) in sign, indicating that the dominant carriers for converting heat gradient to electric field are negatively (positively) charged quarks. The absolute value of $$S_{xx}$$ S xx decreases with increasing temperature. Unlike $$S_{xx}$$ S xx , the sign of N is independent of charge carrier type, and its thermal behavior displays a peak structure. In the presence of strong magnetic field, due to the Landau quantization of transverse motion of (anti-)quarks perpendicular to magnetic field, only the longitudinal Seebeck coefficient ($$S_{zz}$$ S zz ) exists. Our results show that the value of $$S_{zz}$$ S zz at a fixed $$\mu _{q}$$ μ q in the lowest Landau level (LLL) approximation always remains positive. Within the effect of high Landau levels, $$S_{zz}$$ S zz exhibits a thermal structure similar to that in the LLL approximation. As the Landau level increases further, $$S_{zz}$$ S zz decreases and even its sign changes from positive to negative. The computations of these thermoelectric transport coefficients are also extended to a medium with momentum-anisotropy induced by initial spatial expansion as well as strong magnetic field.

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Collective excitations of a hot anisotropic QCD medium with the Bhatnagar-Gross-Krook collisional kernel within an effective description

Cited by 31 publications

References 96 publications

Bulk viscosity of a hot QCD medium in a strong magnetic field within the relaxation-time approximation

Bulk viscosity of a hot QCD medium in a strong magnetic field within the relaxation-time approximation

Passage of heavy quarks through the fluctuating hot QCD medium

Thermoelectric properties of the (an-)isotropic QGP in magnetic fields

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