Department of Physics
Permanent URI for this collectionhttp://localhost:4000/handle/123456789/1932
Browse
8 results
Search Results
Item Probing color superconducting phases and neutron superfluidity via hydrodynamic evolution at FAIR and NICA(India International Centre, 2016) Das, ArpanHigh baryon density regions of the cores of neutron stars are expected to have exotic phases such as color superconducting phases. The symmetry breaking pattern of these phases allows for topological vortices. Even in the lower density region of neutron star, neutron superfluid and associated topological vortices play important role in the dynamics of neutron star, e.g. in pulsar timings and glitches. We consider the possibility of formation of these superfluid phases in heavy-ion collision experiments, e.g. at FAIR and NICA, by carrying out Hydrodynamic simulation. Our result shows that existence of superfluid phases can be detected by studying the effect of vortices on power spectrum of flow fluctuations. (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 Quantum baryon number fluctuations in subsystems of a hot and dense relativistic gas of fermions(2021-05) Das, ArpanQuantum features of the baryon number fluctuations in subsystems of a hot and dense relativistic gas of fermions are analyzed. We find that the fluctuations in small systems are significantly increased compared to their values known from the statistical physics, and diverge in the limit where the system size goes to zero. The numerical results obtained for a broad range of the thermodynamic parameters expected in heavy-ion collisions are presented. They can be helpful to interpret and shed new light on the experimental data.Item Azimuthal anisotropy of dijet events in PbPb collisions at = 5.02 TeV(Springer, 2023) Das, ArpanThe path-length dependent parton energy loss within the dense partonic medium created in lead-lead collisions at a nucleon-nucleon center-of-mass energy of = 5.02 TeV is studied by determining the azimuthal anisotropies for dijets with high transverse momentum. The data were collected by the CMS experiment in 2018 and correspond to an integrated luminosity of 1.69 nb−1. For events containing back-to-back jets, correlations in relative azimuthal angle and pseudorapidity (η) between jets and hadrons, and between two hadrons, are constructed. The anisotropies are expressed as the Fourier expansion coefficients vn, n = 2–4 of these azimuthal distributions. The dijet vn values are extracted from long-range (1.5 < |∆η| < 2.5) components of these correlations, which suppresses the background contributions from jet fragmentation processes. Positive dijet v2 values are observed which increase from central to more peripheral events, while the v3 and v4 values are consistent with zero within experimental uncertainties.Item Dynamics of hot QCD matter 2024 — bulk properties(World Scientific, 2025) Das, ArpanThe second Hot QCD Matter 2024 conference at IIT Mandi focused on various ongoing topics in high-energy heavy-ion collisions, encompassing theoretical and experimental perspectives. This proceedings volume includes 19 contributions that collectively explore diverse aspects of the bulk properties of hot QCD matter. The topics encompass the dynamics of electromagnetic fields, transport properties, hadronic matter, spin hydrodynamics, and the role of conserved charges in high-energy environments. These studies significantly enhance our understanding of the complex dynamics of hot QCD matter, the quark–gluon plasma (QGP) formed in high-energy nuclear collisions. Advances in theoretical frameworks, including hydrodynamics, spin dynamics and fluctuation studies, aim to improve theoretical calculations and refine our knowledge of the thermodynamic properties of strongly interacting matter. Experimental efforts, such as those conducted by the ALICE and STAR collaborations, play a vital role in validating these theoretical predictions and deepening our insight into the QCD phase diagram, collectivity in small systems, and the early-stage behavior of strongly interacting matter. Combining theoretical models with experimental observations offers a comprehensive understanding of the extreme conditions encountered in relativistic heavy-ion and proton-proton collisions.Item J/ψ suppression in Au+ Au collisions at RHIC: Colour screening scenario in the bag model at variable participant numbers(Elsevier, 2007-11) Mishra, MadhukarWe have modified the colour screening theory of Chu and Matsui by properly incorporating bag model equation of state for quark–gluon plasma (QGP). We have also chosen the pressure parametrization rather than parameterizing energy density in the transverse plane. We assume that the QGP dense medium is expanding in the longitudinal direction obeying Bjorken boost invariant scaling law. Sequential melting of , and is also considered in this scenario. We have applied above formulation to the recent PHENIX experimental data of suppression in collisions at RHIC. We find that the model gives a good description of data at mid-rapidity in terms of survival probability versus number of participants without any necessity of implementing ()-dimensional expansion of the deconfined mediumItem Azimuthal flow of decay photons in relativistic nuclear collisions(APS, 2006-10) Layek, BiswanathAn overwhelming fraction of photons from relativistic heavy-ion collisions has its origin in the decay of π0 and η mesons. We calculate the azimuthal asymmetry of the decay photons for several azimuthally asymmetric pion distributions. We find that the kT dependence of the elliptic flow parameter v2 for the decay photons closely follows the elliptic flow parameter vπ02 evaluated at pT≈kT+δ, where δ≈0.1−0.2 GeV, for typical pion distributions measured in nucleus-nucleus collisions at relativistic energies. Similar results are obtained for photons from the 2−γ decay of η mesons. Assuming that the flow of π0 is similar to those for π+ and π− for which independent measurements would be generally available, this ansatz can help in identifying additional sources for photons. Taken along with quark number scaling suggested by the recombination model, it may help to estimate v2 of the parton distributions in terms of azimuthal asymmetry of the decay photons at large kT.