10,271 research outputs found
Relativistic Hartree-Fock theory. Part I: density-dependent effective Lagrangians
Effective Lagrangians suitable for a relativistic Hartree-Fock description of
nuclear systems are presented. They include the 4 effective mesons and with density-dependent meson-nucleon couplings. The
criteria for determining the model parameters are the reproduction of the
binding energies in a number of selected nuclei, and the bulk properties of
nuclear matter (saturation point, compression modulus, symmetry energy). An
excellent description of nuclear binding energies and radii is achieved for a
range of nuclei encompassing light and heavy systems. The predictions of the
present approach compare favorably with those of existing relativistic mean
field models, with the advantage of incorporating the effects of pion-nucleon
coupling.Comment: 26 pages, 5 table
Neutron star properties in density-dependent relativistic Hartree-Fock theory
With the equations of state provided by the newly developed density dependent
relativistic Hartree-Fock (DDRHF) theory for hadronic matter, the properties of
the static and -equilibrium neutron stars without hyperons are studied
for the first time, and compared to the predictions of the relativistic mean
field (RMF) models and recent observational data. The influences of Fock terms
on properties of asymmetric nuclear matter at high densities are discussed in
details. Because of the significant contributions from the - and
-exchange terms to the symmetry energy, large proton fractions in
neutron stars are predicted by the DDRHF calculations, which strongly affect
the cooling process of the star. The critical mass about 1.45 , close
to the limit 1.5 determined by the modern soft X-ray data analysis,
is obtained by DDRHF with the effective interactions PKO2 and PKO3 for the
occurrence of direct Urca process in neutron stars. The maximum masses of
neutron stars given by the DDRHF calculations lie between 2.45 M and
2.49 M, which are in reasonable agreement with high pulsar mass from PSR B1516+02B. It is also found that the mass-radius
relations of neutron stars determined by DDRHF are consistent with the
observational data from thermal radiation measurement in the isolated neutron
star RX J1856, QPOs frequency limits in LMXBs 4U 0614+09 and 4U 1636-536, and
redshift determined in LMXBs EXO 0748-676.Comment: 28 pages, 11 figure
A Pragmatic Study on the Conversational Functions of Internet Catchwords
In recent years, Internet catchwords have been widely used as a new form of language in daily communication. The paper makes an analysis of the functions of Internet catchwords in the process of conversation from the perspective of pragmatics. It is found that when using Internet catchwords according to the five kinds of interpersonal relationship and the content of conversation, people violate the cooperative principle to make conversational implicature so as to strengthen or shorten the pragmatic distance between the conversation makers, guarantee the smooth ongoing of the conversation and maintain a harmonious interpersonal relationship. The study may help people to have a better understanding of the function of Internet catchwords in the process of conversation
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