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New Astrophysics Study Findings Reported From G.B. Alaverdyan And Co

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  • New Astrophysics Study Findings Reported From G.B. Alaverdyan And Co

    NEW ASTROPHYSICS STUDY FINDINGS REPORTED FROM G.B. ALAVERDYAN AND CO-AUTHORS

    Science Letter
    May 19, 2009

    According to a study from Yerevan, Armenia, "The equation of state
    of neutron star matter is examined in terms of the relativistic
    mean-field theory, including a scalar-isovector delta-meson effective
    field. The constants of the theory are determined numerically so that
    the empirically known characteristics of symmetric nuclear matter
    are reproduced at the saturation density."

    "The thermodynamic characteristics of both asymmetric nucleonic matter
    and beta-equilibrium hadron-electron npe-plasmas are studied. Assuming
    that the transition to strange quark matter is an ordinary first-order
    phase transition described by Maxwell's rule, a detailed study is made
    of the variations in the parameters of the phase transition owing to
    the presence of a delta-meson field. The quark phase is described using
    an improved version of the bag model, in which interactions between
    quarks are accounted for in a one-gluon exchange approximation,"
    wrote G.B. Alaverdyan and colleagues (see also Astrophysics).

    The researchers concluded: "The characteristics of the phase transition
    are determined for various values of the bag parameter within the range
    B a [60,120]MeV/fm(3) and it is shown that including a delta-meson
    field leads to a reduction in the phase transition pressure P (0) and
    in the concentrations n (N) and n (Q) at the phase transition point."

    Alaverdyan and colleagues published the results of their research
    in Astrophysics (Relativistic mean-field theory equation of state
    of neutron star matter and a Maxwellian phase transition to strange
    quark matter. Astrophysics, 2009;52(1):132-150).
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