31 research outputs found
Propagation of non-linear waves in hot, ideal, and non-extensive quark-gluon plasma
We study the propagation of energy density perturbation in a hot, ideal
quark-gluon medium in which quarks and gluons follow the Tsallis-like momentum
distributions. We have observed that a non-extensive MIT bag equation of state
obtained with the help of the quantum Tsallis-like distributions gives rise to
a breaking wave solution of the equation dictating the evolution of energy
density perturbation. However, the breaking of waves is delayed when the value
of the Tsallis q parameter and the Tsallis temperature T are higher.Comment: Matches with the version accepted by the European Physical Journal
A random walk with heavy flavours
We focus on evaluating transport coefficients like drag and diffusion of
heavy quarks (HQ) passing through Quark Gluon Plasma using perturbative QCD
(pQCD). Experimental observable like nuclear suppression factor (RAA) of HQ is
evaluated for both zero and non-zero baryonic chemical potential ({\mu}_B)
scenarios using Fokker- Planck equation. Theoretical estimates of RAA are
contrasted with experiments.Comment: Invited article in Special Issue: "Physics of Quark Gluon Plasma: An
Update and Status Report" in Advances in High Energy Physic
Dead cone due to parton virtuality
A general expression for the dead cone of gluons radiated by virtual partons
has been derived. The conventional dead cone for massive on-shell quarks and
the dead cone for the massless virtual partons have been obtained by using
different limits of the general expression. Radiative suppression due to the
virtuality of initial parton jets in Heavy-Ion Collisions (HIC) has been
discussed. It is observed that the suppression caused by the high virtuality is
overwhelmingly large as compared to that on account of conventional dead-cone
of heavy quarks. The dead cone due to virtuality may play a crucial role in
explaining the observed similar suppression patterns of light and heavy quarks
jets in heavy ion collisions at Relativistic Heavy Ion Collider (RHIC)
Time Evolution of Temperature Fluctuation in a Non-Equilibrated System
The evolution equation for inhomogeneous and anisotropic temperature
fluctuation inside a medium is derived within the ambit of Boltzmann Transport
Equation (BTE) for a hot gas of massless particles. Also, specializing to a
situation created after heavy-ion collision (HIC), we analyze the Fourier space
variation of temperature fluctuation of the medium using its temperature
profile. The effect of viscosity on the variation of fluctuations in the latter
case is investigated and possible implications for early universe cosmology,
and its connection with HICs are also explored.Comment: 5 pages, 5 figures, Minor changes in the tex
Analytical calculations of the Quantum Tsallis thermodynamic variables
In this article, we provide an account of analytical results related to the
Tsallis thermodynamics that have been the subject matter of a lot of studies in
the field of high-energy collisions. After reviewing the results for the
classical case in the massless limit and for arbitrarily massive classical
particles, we compute the quantum thermodynamic variables. For the first time,
the analytical formula for the pressure of a Tsallis-like gas of massive bosons
has been obtained. Hence, this article serves both as a brief review of the
knowledge gathered in this area, and as an original research that forwards the
existing scholarship. The results of the present paper will be important in a
plethora of studies in the field of high-energy collisions including the
propagation of non-linear waves generated by the traversal of high-energy
particles inside the quark-gluon plasma medium showing the features of
non-extensivity