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Nuclear matter
About: Nuclear matter is a research topic. Over the lifetime, 10180 publications have been published within this topic receiving 248261 citations.
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TL;DR: In this paper, the effects of the in-medium three-body interaction and the two-body short-range tensor force owing to the $\ensuremath{\rho}$ meson exchange, as well as the shortrange nucleon correlation on the high-density behavior of the nuclear symmetry energy, are demonstrated respectively in a transparent way.
Abstract: Within the interacting Fermi gas model for isospin asymmetric nuclear matter, effects of the in-medium three-body interaction and the two-body short-range tensor force owing to the $\ensuremath{\rho}$ meson exchange, as well as the short-range nucleon correlation on the high-density behavior of the nuclear symmetry energy, are demonstrated respectively in a transparent way. Possible physics origins of the extremely uncertain nuclear symmetry energy at suprasaturation densities are discussed.
71 citations
TL;DR: In this article, the effect of temperature and trapped neutrinos on the phase transition to a kaon-nucleus phase was investigated, and it was shown that a first order phase transition is possible only for magnitudes of the kaon nucleus optical potential (greater or similar sign)100 MeV.
Abstract: We study the equation of state of kaon-condensed matter including the effects of temperature and trapped neutrinos. Several different field-theoretical models for the nucleon-nucleon and kaon-nucleon interactions are considered. It is found that the order of the phase transition to a kaon-condensed phase, and whether or not Gibbs' rules for phase equilibrium can be satisfied in the case of a first order transition, depend sensitively on the choice of the kaon-nucleon interaction. To avoid the anomalous high-density behavior of previous models for the kaon-nucleon interaction, a new functional form is developed. For all interactions considered, a first order phase transition is possible only for magnitudes of the kaon-nucleus optical potential (greater-or-similar sign)100 MeV. The main effect of finite temperature, for any value of the lepton fraction, is to mute the effects of a first order transition, so that the thermodynamics becomes similar to that of a second order transition. Above a critical temperature, found to be at least 30-60 MeV depending upon the interaction, the first order transition disappears. The phase boundaries in baryon density versus lepton number and baryon density versus temperature planes are delineated, which is useful in understanding the outcomes of proto-neutron star simulations. We find thatmore » the thermal effects on the maximum gravitational mass of neutron stars are as important as the effects of trapped neutrinos, in contrast to previously studied cases in which the matter contained only nucleons or in which hyperons and/or quark matter were considered. Kaon-condensed equations of state permit the existence of metastable neutron stars, because the maximum mass of an initially hot, lepton-rich proto-neutron star is greater than that of a cold, deleptonized neutron star. The large thermal effects imply that a metastable proto-neutron star's collapse to a black hole could occur much later than in previously studied cases that allow metastable configurations. (c) 2000 The American Physical Society.« less
71 citations
TL;DR: In this paper, it was shown that most of the observed energy dependence of the local equivalent bare potential arises from the exchange nonlocality, which is an intrinsically quantum phenomenon and can be studied through the refractive elastic scattering of these systems at intermediate energies.
Abstract: Nonlocal interactions are an intrinsically quantum phenomenon. In this work we point out that, in the context of heavy ions, such interactions can be studied through the refractive elastic scattering of these systems at intermediate energies. We show that most of the observed energy dependence of the local equivalent bare potential arises from the exchange nonlocality. The nonlocality parameter extracted from the data was found to be very close to the one obtained from folding models. The effective mass of the colliding, heavy-ion, system was found to be close to the nucleon effective mass in nuclear matter.
71 citations
TL;DR: Appelquist and Quinn as discussed by the authors proposed a general unitarity program in the unitarity gauge, and the execution of this program was carried out by T. Appelquist, H. Quinn, and Y.-P Yao.
Abstract: *Work supported in part by the U. S. Atomic Energy Commission. The execution of this program in the unitarity gauge has been carried out by T. Appelquist and H. Quinn (private communication) . Y.-P. Yao, Phys. Rev. D 7, 1647 (1973). Notations and metric used in this note are the same as those in this reference. 3G. 't Hooft, Nucl. Phys. B33, 173 (1971), B35, 167 (1971); B. W. Lee, Phys. Rev. D 5, 823 (1972); B. W. Lee and J. Zinn-Justin, ibid. 5, 3121 (1972); 5, 3137 (1972); 5, 3155 (1972); E. S. Fradkin and I. V. Tyutin, P. N. Lebedev Physical Institute Report No. N55, 1972 (unpublished) . 4For example, A. A. Slavnov, Kiev report, 1971 (unpublished). ~A somewhat restricted class of gauges with K = (m has been considered by K. Fujikawa, B. W. Lee, and A. I. Sanda, Phys. Rev. D 6, 2923 (1972). T. D. Lee and C. N. Yang, Phys. Rev. 128, 885 (1962). ~E. C. G. Stueckelberg, Helv. Phys. Acta 11, 299 (1938); R. P. Feynman, Acta Phys. Polon. 24, 697 (1963); 't Hooft (see Ref. 3). BIn fact, we do not expect them to be satisfied because of the Adler-BellJackiw-type anomaly. See D. Gross and R. Jackiw, Phys. Rev. D 6, 477 (1972); C. Bouchiat, J. Iliopoulos, and Ph. Meyer, Phys. Lett. 38B, 519 (1972). ~T. Appelquist and H. Quinn, Phys. Letters 398, 229 (1972).
71 citations
TL;DR: In this paper, the Andreev-Bashkin entrainment matrix is derived for arbitrary nuclear asymmetry at zero temperature and in the limits of small relative currents in the framework of the energy density functional theory.
Abstract: Hydrodynamic simulations of neutron star cores that are based on a two-fluid description in terms of a neutron-proton superfluid mixture require the knowledge of the Andreev-Bashkin entrainment matrix which relates the momentum of one constituent to the currents of both constituents. This matrix is derived for arbitrary nuclear asymmetry at zero temperature and in the limits of small relative currents in the framework of the energy density functional theory. The Skyrme energy density functional is considered as a particular case. General analytic formulas for the entrainment parameters and various corresponding effective masses are obtained. These formulas are applied to the liquid core of a neutron star composed of homogeneous plasma of nucleons, electrons, and possibly muons in \ensuremath{\beta} equilibrium.
71 citations