Measurement quantum mechanics, the theory of a quantum system which undergoes a measurement process, is introduced by a loop of mathematical equivalencies connecting previously proposed approaches. The unique phenomenological parameter of the theory is linked to the physical properties of an informational environment acting as a measurement apparatus which allows for an objective role of the observer. Comparison with a recently reported experiment suggests how to investigate novel interesting regimes for the quantum Zeno effect.03.65.Bz, 42.50.Wm
We study various neutron star properties using the Color-Dielectric model to describe quark matter. For the baryon sector at low densities we employ the Walecka model. Applying Gibbs criteria to this composite system, we find that, for matter at β-equilibrium, the pure hadronic phase ends at 0.11 fm−3 and that the mixed quark and hadronic phase extends to 0.31 fm−3. The resulting equation of state yields a maximum neutron star mass of 1.59M⊙. A neutron star with total mass of 1.4M⊙ will consist of a crust made of hadronic matter only, a ∼ 1 km thick region of mixed phase and a core composed of pure quark matter. Implications for the cooling of neutron stars are discussed
We study the equation of state of quark matter at finite temperature, using a confinement model in which chiral symmetry remains broken in the deconfined phase. Implications for type II supernova explosion and for the structure and evolution of the proto-neutron star are discussed.PACS numbers: 26.50.+x, 24.85.+p, 12.39.-x, 26.60.+c
We study the equation of state (EOS) of quark matter at zero temperature, using the Color Dielectric Model (CDM) to describe confinement. Sensible results are obtained in the version of the CDM for which confinement is imposed smoothly. The two-phases version of the model turns out to give unrealistic results for the EOS. Chiral symmetry plays a marginal rôle and the quarks are massive till high densities. The deconfinement phase transition is smooth and unlikely to be first order. Instabilities of the quark matter and the gap equation are discussed.24.10.Jv Relativistic models, 24.85.+p Quarks, gluons and QCD in nuclei and nuclear processes Typeset using REVT E X 1
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