Swatantra Kumar Tiwari

Electrical conductivity of Hot and Dense QCD matter at RHIC BES energies: A Color String Percolation Approach.

Recently, transport coefficients, viz., shear viscosity, electrical conductivity, etc., of strongly interacting matter produced in heavy-ion collisions have drawn considerable interest. We study the normalized electrical conductivity (σel/T) of hot QCD matter as a function of temperature (T) using the color string percolation model (CSPM). We also study the temperature dependence of shear viscosity and its ratio with electrical conductivity for the QCD matter. We compare CSPM estimations with various existing results and lattice QCD predictions with (2+1) dynamical flavors. We find that σel/T in CSPM has a very weak dependence on the temperature. We compare CSPM results with those obtained in the Boltzmann approach to multiparton scatterings model. A good agreement is found between CSPM results and predictions of the Boltzmann approach to multiparton scatterings with a fixed strong coupling constant.

Energy and centrality dependent study of deconfinement phase transition in a color string percolation approach at RHIC energies

Abstract.We take the experimental data for transverse momentum spectra of identified charged hadrons in different centrality classes for nucleus-nucleus

Elliptic flow in Pb+Pb collisions at

(A+A)

\sqrt{s_{{\rm NN}}} = 2.76

(A+A) collisions at various Relativistic Heavy-Ion Collider (RHIC) energies measured by the STAR Collaboration. We analyse these data in the framework of the color string percolation model (CSPM) in order to extract various percolation parameters at different centralities at RHIC energies to study the effect of collision geometry and collision energy. We use these parameters to study the centrality dependent behaviour of initial temperature of the percolation cluster, energy density, average transverse momentum, shear viscosity to entropy density ratio (

TeV at the LHC using Boltzmann transport equation with non-extensive statistics

\eta/s

Transverse-momentum spectra and nuclear modification factor using Boltzmann Transport Equation with flow in Pb+Pb collisions at \sqrt{s_{NN}} = 2.76 TeV

η/s and trace anomaly for different energies at RHIC from

Transverse energy per charged particle in heavy-ion collisions: Role of collective flow

\sqrt{s_{\rm NN}} = 19.6

Limiting fragmentation in a thermal model with flow

s NN =19.6 to 200GeV. These observables are found to strongly depend on centrality at various collision energies. The critical percolation density, which is related to the deconfinement phase transition is achieved in the most central nucleus-nucleus collisions, while it fails in the peripheral collisions. A universal scaling is observed in color suppression factor and initial temperatures when studied as a function of charged particle pseudorapidity distribution scaled by nuclear overlap area at RHIC energies. The minimum of

Beam Energy Dependence of Thermodynamic and Transport Properties of Strongly Interacting Matter in a Color String Percolation Approach at the Relativistic Heavy Ion Collider

\eta/s

Radial Flow and Differential Freeze-out in Proton-Proton Collisions at

η/s is observed in the most central collisions at