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Nuclear Theory·nucl-th

Friday·September 13, 2019

8 papers—3 primary·5 cross-listed

All8Primary3Cross-lists5
  1. 04

    Role of vector channel in different classes of (non) magnetized neutron stars

    Luiz L. Lopes🇧🇷 · Debora P. Menezes🇧🇷

    We study how the magnetic field and non-standard vector channels affect hadronic, quarkionic and hybrid stars. In the hadronic phase, we use the QHD model, within its standard mesons, and compare the results with the ones obtained with the inclusion of the strangeness hidden meson. In the quark phase, we use the standard SU(3) NJL and compare the results with the version that takes into account the vector channel . Magnetic fields are taken into account via chaotic magnetic field approximation.

    ↳ astro-ph.HEnucl-thEPJA(2020)·31 citations
  2. 05

    The breaking of continuous scale invariance to discrete scale invariance: a universal quantum phase transition

    Omrie Ovdat · Eric Akkermans

    We provide a review on the physics associated with phase transitions in which continuous scale invariance is broken into discrete scale invariance. The rich features of this transition characterized by the abrupt formation of a geometric ladder of eigenstates, low energy universality without fixed points, scale anomalies and Berezinskii-Kosterlitz-Thouless scaling is described. The important role of this transition in various celebrated single and many body quantum systems is discussed along with recent experimental realizations. Particular focus is devoted to a recent realization in graphene.

    ↳ cond-mat.mes-hallmath-phmath.MPquant-ph1 citation
  3. 06

    Finite Size Scaling in Time Evolution During the Colorless-QCD Confining Phase Transition

    Salah Cherif🇩🇿 · Madjid Lakhdar Hamou Ladrem🇸🇦 · Z.Z. Alfull🇸🇦 · M.A.A. Ahmed🇲🇾

    The time evolution of the expanding Colorless Partonic Matter, created in Ultra-Relativistic Heavy Ion Collisions and undergoing the confining phase transition towards a Hadronic Gas, is discussed in the context of a unified model combining our Colorless QCD-MIT Bag Model with the boost invariant Bjorken expansion. The Bjorken Equation in the case of a longitudinal expansion scenario of a non-ideal relativistic medium in finite volume is solved using certain initial conditions and their effect is studied in detail. The evolution of the temperature as a function of the proper time is then obtained at different volumes. Different times characterising different scales of the whole time evolution, like the time of the finite volume transition point , the hadronic time at which the hadronization is completed, the lifetime of the Colorless Partonic Plasma and the lifetime of the confining phase transition are calculated and their finite size scaling properties are studied in detail. New finite size scaling laws are derived. Also, the time evolution of some Thermal Response Functions as the order parameter , energy density , pressure and the sound velocity are investigated and studied in detail. We find that the time evolution of our system is really affected by the colorlessness requirement and the initial conditions of the partonic matter: the closer the volume is to the thermodynamic limit, the longer are the times and the lifetimes of the system. A detailed analysis of the temporal decreasing, in negative power, of the energy density in each of the three stages of the Bjorken expansion is carried out.

    ↳ hep-phnucl-th1 citation
  4. 07

    Three-body unitarity versus finite-volume spectrum from lattice QCD

    M. Mai🇺🇸 · M. Döring🇺🇸 · C. Culver🇺🇸 · A. Alexandru🇺🇸

    Strong three-body interactions above threshold govern the dynamics of many exotics and conventional excited mesons and baryons. Three-body finite-volume energies calculated from lattice QCD promise an ab-initio understanding of these systems. We calculate the three- spectrum unraveling the three-body dynamics that is tightly intertwined with the -matrix principle of three-body unitarity and compare it with recent lattice QCD results. For this purpose, we develop a formalism for three-body systems in moving frames and apply it numerically.

    ↳ hep-latnucl-thPRD(2020)·106 citations
  5. 08

    Role of event multiplicity on hadronic phase lifetime and QCD phase boundary in ultrarelativistic collisions at energies available at the BNL Relativistic Heavy Ion Collider and CERN Large Hadron Collider

    Dushmanta Sahu🇮🇳 · Sushanta Tripathy🇮🇳 · Girija Sankar Pradhan🇮🇳 · Raghunath Sahoo🇮🇳

    Hadronic resonances, having very short lifetime, like , can act as useful probes to understand and estimate lifetime of hadronic phase in ultra-relativistic proton-proton, p--Pb and heavy-ion collisions. Resonances with relatively longer lifetime, like meson, can serve as a tool to locate the QGP phase boundary. We estimate a lower limit of hadronic phase lifetime in Cu--Cu and Au--Au collisions at RHIC, and in pp, p--Pb and Pb--Pb collisions at different LHC collision energies. Also, we obtain the effective temperature of meson using Boltzmann-Gibbs Blast-Wave function, which gives an insight to locate the QGP phase boundary. We observe that the hadronic phase lifetime strongly depends on final state charged-particle multiplicity, whereas the QGP phase and hence the QCD phase boundary shows a very weak multiplicity dependence. This suggests that the hadronisation from a QGP state starts at a similar temperature irrespective of charged-particle multiplicity, collision system and collision energy, while the endurance of hadronic phase is strongly dependent on final state charge-particle multiplicity, system size and collision energy.

    ↳ hep-phhep-exnucl-exnucl-thPRC(2020)·29 citations

Affiliations

first authorsco-authorsvia INSPIRE