BITS Faculty Publications
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Item Thermoelectric effect and seebeck coefficient of hot and dense hadronic matter in the hadron resonance gas model(Springer, 2021-05) Das, ArpanWe study the thermoelectric effect of a baryon-rich plasma, with a temperature gradient, produced in heavy-ion collision experiments. We estimate the Seebeck coefficient for the hot and dense hadronic matter within the framework of relativistic kinetic theory using relaxation time approximation. For quantitative analysis, we use the hadron resonance gas model with hadrons and resonance states up to a cutoff in the mass as 2.25 GeV. The current produced due to temperature gradient can be a source of a magnetic field in heavy-ion collision experiments.Item Thermoelectric effect and seebeck coefficient for hot and dense hadronic matter(APS, 2019) Das, ArpanWe investigate the thermoelectric effect for baryon rich plasma produced in heavy ion collision experiments. We estimate the associated Seebeck coefficient for the hadronic matter. Using kinetic theory within relaxation time approximation we calculate the Seebeck coefficient of a hadronic medium with a temperature gradient. The calculation is performed for hadronic matter modeled by the hadron resonance gas model with hadrons and resonance states up to a cutoff in the mass as 2.25 GeV. We argue that the thermoelectric current produced by such effect can produce a magnetic field in heavy ion collision experiments.Item Magneto-Seebeck coefficient and Nernst coefficient of a hot and dense hadron gas(APS, 2020-07) Das, ArpanWe discuss the thermoelectric effect of hot and dense hadron gas within the framework of the hadron resonance gas model. Using the relativistic Boltzmann equation within the relaxation time approximation we estimate the Seebeck coefficient of the hot and dense hadronic medium with a gradient in temperature and baryon chemical potential. The hadronic medium in this calculation is modeled by the hadron resonance gas (HRG) model with hadrons and their resonances up to a mass cutoff Λ ∼2.6 GeV . We also extend the formalism of the thermoelectric effect for a nonvanishing magnetic field. The presence of magnetic field also leads to a Hall type thermoelectric coefficient (Nernst coefficient) for the hot and dense hadronic matter apart from a magneto-Seebeck coefficient. We find that generically in the presence of a magnetic field the Seebeck coefficient decreases while the Nernst coefficient increases with the magnetic field. At higher temperature and/or baryon chemical potential these coefficients approach to their values at vanishing magnetic field.Item Diffusion matrix associated with the diffusion processes of multiple conserved charges in a hot and dense hadronic matter(APS, 2022) Das, ArpanBulk matter produced in heavy ion collisions can have multiple conserved quantum numbers like baryon number, strangeness and electric charge. The diffusion process of these charges can be described by a diffusion matrix describing the interdependence of diffusion of different charges. The diffusion coefficient matrix is estimated here from the Boltzmann kinetic theory for the hadronic phase within relaxation time approximation. In the derivation for the same, we impose the Landau-Lifshitz conditions of fit. This leads to, e.g., the diagonal diffusion coefficients to be manifestly positive definite. The explicit calculations are performed within the ambit of hadron resonance gas model with and without excluded volume corrections. It is seen that the off-diagonal components can be significant to affect the charge diffusion in a fluid with multiple conserved charges. The excluded volume correction effects is seen to be not significant in the estimation of the elements of the diffusion matrix.Item Transport properties of hot hadronic matter in heavy ion collisions in van der Walls hadron resonance gas model(Elsevier, 2025-12) Das, ArpanWe estimate the transport coefficient like shear viscosity of hot hadronic matter in van der Walls hadron resonance gas (VDW HRG) model. We have compared the results of VDW HRG model with ideal HRG model and excluded volume hadron resonance (EV HRG ) model. We have calculated these coefficients in relaxation time approximation. decreases as the temperature of the hadronic system increases at a fixed baryon chemical potential. is always smaller in VDW HRG model compared to EV HRG model due to the large entropy density in VDW HRG compared to EV HRG case.Item Diffusion matrix associated with conserved charges in relativistic heavy ion collisions(Elsevier, 2025-12) Das, ArpanMatter produced in heavy ion collisions has multiple conserved numbers like baryon number, strangeness and electric charge. The diffusion process of these charges can be described by a diffusion matrix describing the interdependence of diffusion of different charges. Incorporating the Landau-Lifshitz frame condition, we have estimated the diffusion coefficient matrix using Boltzmann kinetic theory for the hadronic phase within relaxation time approximation.